I'm too lazy to reminisce about the past but for this generation my top 10 favorite games are:

(Note I Only have a ps3...)

#1: Dead Space (My Rating: 90%) A-
#2: Demon's Souls (My Rating: 90%) A-
#3: Valkyria Chronicles (My Rating: 89.6%) B+
#4: Uncharted: Drake's Fortune (My Rating: 87.5%) B+
#5: LittleBigPlanet (My Rating: 86.9%) B
#6: Metal Gear Solid 4: Guns of the Patriots (My Rating: 85.4%) B
#7: Killzone 2 (My Rating: 84.2%) B
#8: Resistance 2 (My Rating: 82.7%) B-
#9: Bioshock (My Rating: 82.5%) B-
#10: Infamous (My Rating: 81.3%) B-

The worst game i have ever played in this generation currently is:
#18: Far Cry 2 (My Rating: 58.5%) F+

1. Metal Gear Solid 4: Guns of the Patriots

2-7:

Deus Ex
Metal Gear Solid 3: Snake Eater
Half Life 2
Xenogears
Okami
Shadow of the Collosus

And under that there are a lot of games :P

1. Deus Ex (Amazing story, still hasn't been bested in terms of story and a believable and interactive world)
2. Half-Life 2 (Half-Life perfected, and with a gravity gun)
3. Metal Gear Solid
4. Elder Scrolls 4: Oblivion
5. Age of Empires 2 (balance and great multiplayer)
6. Star Wars: Knights of the Old Republic
7. Chrono Trigger
8. Starcraft
9. Super Mario World
10. Shadow of the Collosus

Honourable mentions: Tetris, every Zelda game, MGS3 & 4, Baldurs Gate , Planescape Torment and Prince of Persia (3D)

It was a tough choice but I've narrowed it downn. The list is in goes in any order:

1: Metal Gear Solid (PS1)
2. Mass Effect (360)
3. Zelda OT (N64)
4. Killer Instinct (SNES)
5. Tekken 5 (PS2)
6. Shadow of the Colossus (PS2)
7. Halo (Xbox)
8. Star Wars KOTOR 2 (Xbox)
9. Uncharted (PS3)
10. Super Mario 64 (N64)

Half-Life
Fallout 3
Elder Scrolls III: Morrowind
Warcraft III
Final Fantasy VIII
Metal Gear Solid 3: Snake Eater
Counter Strike: Source
The Orange Box (Steam version)
Deus Ex
Diablo II

1. Sonic & Knuckles (Gen)

2. Super Mario Galaxy (Wii)

3. The Legend of Zelda: Ocarina of Time (N64)

4. Sonic the Hedgehog 2 (Gen)

5. Metroid Prime Trilogy (Wii)

6. Super Mario World (SNES)

7. Super Mario 64 (N64)

8. The Legend of Zelda: The Wind Waker (GCN)

9. Banjo-Kazooie (N64)

10. Sonic the Hedgehog 3 (Gen)

What can I say? I love me them platformers.

In no order:

1- Metal Gear Solid
2- Parasite eve
3- Final Fantasy Vii
4- Legend of Legaia
5- Metal Gear Solid 4
6- Legend of Dragoon
7- Persona 2 innocent Sin
8- Zone of the Enders 2
9- Shadow of the colossus
10-Shadow Hearts 2

choosing 10 only is very hard :(
this list can change any time

Hm, in no order

Legend of Zelda: OoT
Super Mario 64
Super Mario Galaxy
Legend of Zelda: Links Awakening
Elder Scrolls III: Morrowind
Pokemon Red/Blue
Rome: Total War
Warcraft II
Final Fantasy IV
Tetris

1) Metal Gear Solid 3
2) Resident Evil 2
3) Tomb Raider 1
4) Streets of Rage 2
5) Metal Gear Solid
6) Dead Rising
7) Silent Hill 1
8) Super Mario Bros 3
9) Sonic 3 & Knuckles
10) Resident Evil 1

these arn't in order just my favourite 10
1. FF7
2. Sonic 2
3. Dragon Quest 8
4. Patapon 2
5. Ratchet and Clank 3
6. FF9
7. Ico
8. Pro Evo 5
9. Sonic and Knuckles
10. Okami