I wouldnt even considered any last-gen game to be a classic right now tbh, since it's just too early. But if i have to choose, here are my list:

IN NO ORDER:

Medieval II: total war. A Classic total war that even by today, considered by many as one of the best TBS/RTS game of alltimes.

God of War II. I know this is a PS2 game, but i considered any game released during 2006-2013 is last-gen/7th gen tbh.

Uncharted 2: Among Thieves. One of the best cinematic game dat i've ever played, No Doubt.

Metal gear solid 4: Gun's Patriots. It was supposed to be the FINAL Metal Gear Solid game in the series, and oh my oh my, how great it was :D!

Assassin's Creed: I really don't know what is more memorable, the awesome camera-assassinated, the twisted story or the repetitive sidequest missions, lol.

I agree, this game was the very first Soul's game. The original! 

I'd put Demon's Souls, but Dark Souls is really what elevated the popularity of the series. For one reason or another, Demon's Souls got far less attention than Dark Souls.

#1: Red Dead Redemption - The deep story, interesting characters, amazing world, engaging gameplay and fantastic wild life and hunting all made this a masterpiece. probably my favorite game out of 7th gen

#2: Killzone 2 - The single player was fantastic, it literally made me feel like i was on a battlefield. but this gems best moments where in its multiplayer. its dynamic 7 mission multiplayer mode "warzone" was the best multiplayer i ever played. every match was different. due to dynamically changing the missions rotations, and the fact that spawning points where chosen by the players them selfs. so the flow of each match was different. levels were big and that suited perfectly for the 32 players in the map, and the maps where awesome. the game was balanced as well.

#3: Call of Duty MW2 - I have played CoD4 with my neighbor, but my first real entry in the CoD franchise was with MW2, and one that hasnt been topped until now. its multiplayer was purely addictive. its prestige's (one that me and my brothers i reached 10 with, mind you) was fantastic. its maps were well made. it has its issues, but they never really pushed me away. this game is the most game i have ever played in my entire life. i spend SO much time with it. purely epic.

#4: GoW3 - The grand finale of kratos's epic saga. the boss battles, the epic scale, the amazing combat makes this game a masterpiece. best boss battles i have ever played, and Posidions battle is still the best boss battle i have ever enjoyed, as well as the best into to a game i have ever experienced by far.

#5 Uncharted 3 - while most people prefer UC2. i think UC3 trumps it. i loved the story mode, its was an amazing and epic ride. but its multiplayer was also fantastic. epic action and great combat. it was one of the best multiplayers i have ever played.

honorable mention is The Last of us and AC2. TLoU is probably the most well made game i ever played, and truly a masterpiece, however at the moment, i feel i should have mentioned the games above. also i more into action adventure games, where TLoU is more of a stealth and survival game. though if i were making the list any given time, TLoU could easily be in there or even top it.

1. Super Mario Galaxy - Explanation Coming
2. Minecraft - Explanation Coming
3. Wii Sports - Explanation Coming
4.
5.

Will edit later.

Still waiting

1- Super Mario Galaxy 2
2- Metal Gear Solid 4: Guns of the Patriots
3- Pokemon Pearl/Diamond/Platinum
4- Pokemon Soul Silver/Heart Gold
5- God of War 3

( i don't put Twilight Princess in the list because have a Gamecube version, i will consider this game in 6 generation console ;D )

these are the five games that I think will be remembered by most as classics of 7th gen, remembering that these are those who imagine achieving this status, it is not my top 5 best games last gen.

1.the Last of Us (for me,the best in entire 7th gen)
2.Mass Effect 2
3.Red Dead Redemption
4.Uncharted 2 Among Thieves
5.Bioshock Infinite (I know the fans of bioshock will remember more of the first, but others gamers will never forget the end, to blow heads,the end of the first game it's just terrible, for me the second best game in the 7th gen)

#5 Mario Galaxy 1 It made Mario feel fresh as a daisy again, and will end up talked about as second only to Mario 64 in terms of quality of title for the time.

#4 Uncharted 2. Revolutionised how we think of cinematic games producing a story good not only for video games, but also for Movies, whilst also holding together all the key gameplay mechanics to make a great game from just a gameplay perspective.

#3 TLOU. Building from the cinematic story telling from UC2+3, Naughty Dog showed that they can produce a more mature reserved story hitting higher emotional highs than ever before, whilst also managing to add depth to the gameplay and mechanics, and then also adding environmental story telling to the mix also make this a must play.

#2 Demon's Souls. In an era of babying gamers with handholding and dumbing down of nearly ever aspect of the modern game, this was a breath of fresh air like no other. A game that chucked you into the world with seemingly very little to help you or few things explained, requiring a thoughtful look into how the game works, what effects what, how to approach an area, a brutal examination of what playstyle suits you, only to become a massively rewarding and accessible game once a bit of patience is learned and the core gameplay mechanics understood, whilst also having a fairness and depth to allow one to feel like a god at almost any level in any area once a degree of mastery is found. Coupled that with level design unrivalled this game really is a legendary game.

#1 Dark Souls. However it's not until the spiritual sequel where From Software really shines a continuous world allows From much more expansive and deep character quest lines than those found in Demon's, whilst also allowing better story telling and insight into how each area affected each other in the story, making the game feel much more cohesive, yet despite the continuous world the level design take no knocks, and if anything improves, with the winding levels becoming a revaltion when a shortcut back to where you started is found, and then another after that, and another after that. Add in the stus system an the run back to a boss room becomes even more intense due to the need to get there in a good enough state so that the fight itself is achievable, rather than just carrying 99 of all the different types of grass and being fine for any boss in the game for Demon's souls. This is a game that will be talked about until the end of time, and will be used as an example of how to produce top quality levels to any future would be game developers for forseeable future.

Mario Galaxy is in there for sure.