I was thinking about a top 5 thread, but then I realized I can't narrow it down that low anymore. Post your top-tier games that you would happily play again.

Shadow of the Colossus
Halo 3
Elder Scrolls V: Skyrim
Fallout 3
Mario Sunshine
Okami
Star Ocean: Till the End of Time
Champions of Norath

(no particular order)

Cannon fodder
Sim citys
Football manager/champ manager
Pain
Madden
Fifa
MAG
infamous
Rockstar Ate My Hamster
Pitfall
Sonic the hedgehog

FF4
FF9
Fallout 3 GOTY
Burnout Paradise
Mercenaries 2 (multiplayer preferably, right Pie?)
LittleBigPlanet 2 (for the creation mode)
Super Street Fighter IV AE
King Of Fighters XIII
Arcana Heart 3
A Guitar Hero where I could handpick my own 100 songs
MAG (provided I was guaranteed games every time I logged on)

Homie you best be trollin'

In no particular order:

FF Tactics Advance
Golden Sun (any of 'em, really)
Tales of Symphonia
Elder Scrolls IV/V: Oblivion/Skyrim
SSB Melee

I think that's it. I really thought hard about adding either Fallout 3 or New Vegas to the list, but there are times that I think about going back to those games and I just cringe, usually because when I stop playing them it's because something's happened that makes me come THIS close to throwing my controller (and it's not bugs, either).

Also, I didn't realize until I finished typing those titles that all but one of those entries are all on Nintendo platforms (I think there's a PS2 Symphonia, but that shit doesn't count 'cause no one played it on PS2).

Come at me, brah.

Smokey: PS2 Symphonia was Japan-only IIRC.

As for me:

Yakuza 4
Bayonetta
NiGHTS Into Dreams... (HD ANNOUNCED, BITCHES!)
Jet Set (Grind) Radio (HD COMING SOON, BITCHES!)
Shenmue 1 & 2
Sonic CD
Tales of Vesperia

There's a lot more, 'cause I love so many games, but those are ones I could easily play forever.

Like I said, doesn't count.

Super Street Fighter 2
NHL 94
Zelda Link to the Past
Tetris
Secret of Mana
Resident Evil
Puzzel Bobble
Deus Ex
Civ3
Halo
Eternal Darkness
Killer 7
Gitaroo Man
RE4
Mario Kart DS
Mirror Edge
The Path
Dragon Age
Dark Souls
Rayman Origins
Super Mario 3D Land
Journey

(In the order I owned them… probably)

Kinda cheating since I put multiple games from franchises, but here they are

Lunar: Silver Star Story Complete
Final Fantasy 4,6 and 9
SFII: Super Turbo
SFIII: Third Strike
Capcom vs. SNK 2
Def Jam: Fight for NY (this shit is good, fuck haters)
Punch Out
MadWorld
Smash Bros Melee
Super Mario Bros
Super Mario Galaxy 1/2
LoZ: Wind Waker
Total Annhilation
Starcraft
Command and Conquer: Red Alert 2
Star Wars: Dark Forces
X-Wing vs. Tie Fighter
Tetris
RE 4
Jak and Daxter 1,2,3
God of War 1,2,3
Timesplitters 2/3

There are others, but I can't be bothered to put them up.

yes.

I don't know what the "best" games I ever played were. "Best" can be defined in a lot of ways. But I can list the ones that I love and probably always will.

Perfect Dark
Metal Gear Solid
Resident Evil 4
Dead Space
Crackdown
Zelda Ocarina of Time
Super Mario 3
Super Smash Bros.
Metroid Prime
Metroid Fusion
Pokemon Red/Blue
Pokemon Silver/Gold

These have defined gaming for me.

Sonic 2
SMB3
Streets of Rage 2
Tetris
Legend of Zelda: Ocarina of Time
Gran Turismo 2
Daytona USA
Soul Calibur
Jet Grind Radio
Metroid Prime
Resident Evil 4
MGS3: Subsistence
Persona 3
Persona 4
SMT: Nocturne
Panzer Dragoon Orta
Rock Band
COD4
Yakuza 4
Mario & Luigi Superstar Saga
Pokemon Yellow
Burnout Revenge

Donkey Kong Country 2
F-Zero GX
Grabbed by the Ghoulies
Galactic Pinball (I'm not even fucking joking)
Viva Pinata
Mario Bros 2 (us)
Star Fox snes
Star Fox Adventures
Kirby 64
MegaMan 1
Megaman X
Valkyria Chronicles

Okami -- Fantastic . The first time any game pulled some kinda emotion outta me.
Super Mario Galaxy -- This game, THIS GAME. I feel nothing but happiness from memories of this one (and I feel nothing but hate for the second one, ironically).
New Vegas (DLC included) -- Say what you want about the bugs, and its low points, I played the hell outta this game.
Kid Icarus -- Controls take some getting used to, but they are perfect for the game. I also noticed that this game never disappointed, and always aimed to please. There were several times where I was like "Aw hey, this is awesome. You know, it'd be freakin' crazy if x happened, but they probably wouldn't do- *x happens, and more*. HORY SHET."... Yeah, moments like that. There's also the fact that the game felt bigger than what the 3DS was capable of doing.
Skyward Sword -- Gotta get this out of the way: This game is severely flawed. The empty overworlds, and lack of exploration really REALLY hamper what this game could've been. HERE BE SECRETSThat, and they used the same boss fight THREE FUCKING TIMES, FUCK THE IMPRISONED FFFFFFFFFFFFFFFFFFFFFF Though I can't help but shake how much I enjoyed this game. The style, music, and gameplay really pulled together an immersive experience that can't really be found in other games right now. While I can't say this is my favorite game at all, I freakin' love it.

I guess I'll add more as I think of em. I can't really pull up a huge list of games that really blew me away. I've enjoyed the hell out of a lot of different games, but these ones are above the rest.


EDIT - Rayman Origins. Just finished up the game earlier today, HERE BE SECRETSand I'm just about to unlock the Land of the Livid Dead. This is probably the best platformer I've ever played, honestly. The art style, soundtrack, and gameplay just sorta ooze together in this one, and it's definitely a great return to form for Rayman. I also seriously want Ubisoft to distribute the Ubiart Framework, because it looks so damn crazy.