Rock Band 3 is easily the best time investment  out of any game you could possibly have had in 2010.  The peripherals are expensive, but once you get them you can pretty much play this game forever.  I have put dozens of hours trying to master the pro drums and nothing else.  The cool thing is that I am starting to get to be a decent drummer now.  The vocals are also super expansive because you can sing both the lead and the harmony.  I still haven't played the keyboard part yet and the Fender Squier hasn't even been released yet.  I look forward to really learning the guitar parts once the Squier is released.  With all the DLC options this game can last pretty much forever.  I plan on putting at least 500 hours into this one. 

The only drawback on this game is cost.  So far I have dropped $129 on this game to get the game and the pro drum set (and I had to use amazon credit and deals to get that price).  I already had the plastic guitar and microphone.  I still need to buy the Midi adapter ($30 on amazon) and eventually the Squier ($280 at lease at Best Buy-- but I need a new guitar ever since mine got stolen).  I already have a Roland keyboard which I will attach once I get the Midi  adapter.  Total cost for me on this game, even with some discounting, is going to be around $450.  Ouch!  But if you are a musician or an aspiring musician this game is utterly fantastic.  The Pro Drums and vocal harmonies are so much fun. The Pro Guitar is going to my most memorable gaming experience of this generation.  

Buy this game!  It needs major support and has not been selling well, especially on the PS3.   

Picross 3D-- I don't think a lot of people bought this game, but it is easily one of the best games on the DS.  Addictive puzzles and tons of downloadable free-content.  This was my best financial investment of 2010 at $9.99

Mass Effect 2 launch and i still play it today A plus. New Vegas (PC) spent a lot of time on it and the bugs was manageable (on PC) but it just wasn't as good as Fallout 3 B. Halo Reach B played it a lot, but it wasn't as fun as Halo 2 or Halo 3.

Not gona choose all but I will choose some.

Final Fantasy XIII:

A Best RPG I have played in a long time.

Mass Effect 2:

A Best WRPG. Period

Fable: The Lost Chapters

Z- - - - - - - - -  - Garbage

Battlefield Bad Company 2:

C- Very disappointing compared to the first one

Heavy Rain:

A New take on a genre and I REALLY enjoyed it

God of War 3:

A- Good game but I was slightly disappointed that it didn't live up to GoW2

Nier:

A If you don't buy this game your not a gamer.

Might as well throw Metroid Other M on there:

I give it a solid B (plus) I enjoyed it.

I would say the Kinect. The thing is a chick magnet and I've gotten 3 girls to buy a 360 with Kinect to play with me online. Soon, you all will be seeing more girls gaming... and it is all thanks to ME!

Oh, c'mon, the concept alone was worth €5! I want a sequel.

My best investments are most definitely Minecraft & Monster Hunter Tri. These are S rankers.

I've gotten quite the bit of value out of Metroid: Other M as well so I give it a solid A.

MAG ($60) - still playing it this days... 200hrs spent in it, not going anywhere until KZ3/SOCOM4 arrives

Playstation Plus ($50) - it keeps getting better each month, today i received Lead&Gold and each month i get a new game to play until september 2011...it can't be better than this.

Halo Reach (79 Euro - Limited edition) over 100 hours in and probably another 100 hours coming, AAAAAA

Splinter Cell Conviction: 60 Euro - 13 hours spent. B

Risk Fractions: 5 Euro - 5 hours B (plus)

Patrician IV (Xmas gift) - 15 hours in and more than 100 hours are to come. AAA

Fable III: (79 Euro - Limited Edition) 4 hours in, but life fucked me during release. will finish it later on.

RDR (Xmas gift) - 5 hours in, will finish it later.

Alan Wake (79 Euro - Limited Edition): 13 hours - great game. B

Kinect (150 Euro): 20 hours in, but with 2011 releases easily over 100 hours will be spent.

Im kind of happy to see that people feel fulfilled after dropping 60$. Ive been burned by so many games that I seldom pay more than $30 for any games(Im usually paying <$15), and I always buy new. Even my new Ninty games usually come with a credit for $20 or so. On to my list:

Best:

Dawn of War 2:Chaos Rising($30): Between myself and my roomate about 520 hours ATM.

S.T.A.L.K.E.R: Shadow Of Chernobyl($5): about 45 hours worth of gameplay

Super Meat Boy($10): Only about 20 hours of gameplay but gave me some tough as nails platforming which I was craving. Still have about 5 boards to 100 percent the game.

Pinballs Greatest Hits:The Williams Collection($9): I loves me some digital pinball(and real pinball) I have put in many hours into the game, probably several hours into "Midevil Madness"

Bad Company 2($50) Yeah I paid 50 for this as they worked hard to add a lot of shit that Modern Warfare 2 devs shunned. Got around $55 hours in and unlocked everything. Not sure why I stopped playing.

Worst:

APB($50): Yep I bought the biggest failure of this generation. Was going to return it after hearing bad reviews, but was 1 day late after the 30 day return policy.I was planning on getting around to playing it but held it off as I had Summer things to attend to. Then they shut down the game servers forever.