In no particular order and I probably won't remember all of them:
Portal. WHEEEEEEEEEEEEEEEE~! Speedy thing goes in, speed thing comes out! Also, GlaDOS <3
Shadow of the Colossus. You mean I get to fight giant monsters and ACTUALLY FIGHT THEM, not just hack at their feet and watch them flash in some arcade-y mockery of combat? SQUEEEEEEE~
Starfox. This picture perfectly reflects how I felt playing this game as a kid:
TMNT 4: Turtles in time. Don't tell me this music doesn't get ANYONE that's played this game pumped up.
Super Mario 64. First truly 3D game for a ton of NES generation gamers like me, and it was brilliant.
Devil May Cry 3. Those cutscenes, those moves, those boots o_o. It helps that the gameplay was amazing too.
Final Fantasy 12. SQUARE MADE A DECENT RPG IN THEIR MAIN SERIES AFTER 6? Shame they let me down with 13 again.
Monster Hunter Freedom. So much awesome packed into a portable game. The first time Rathalos lands in your innocent little egg-hunting quest is a true brick-shitter.
Zone of the Enders. Holy crap, it's a giant robot game done RIGHT. Story blew, but the gameplay was what I'm sure a lot of mecha fans had been waiting for. Now if only the multiplayer were a little more fleshed out and we could get a ZoE3 at some point.
Katamari Damacy. Na naaaaaaaa, na na na na na na naaaa, na KATAMARI DAMACYYYYY!
Cave Story. Best one-man game ever. Best free game ever. One of the best games ever period. Holy crap this game is awesome.
Half-life 2. GRAVITY GUN!

Ravenholm! D:
GTA4. OMG EUPHORIA ENGINE! Euphoria engine is easily the most aptly named game engine ever. I was in a euphoric state running down crowds as they very realistically rolled over my hood, under my tired, and out of the way. The only GTA where driving into people slowly might be even more fun than doing it at top speed. SO much better than ragdolls.
Initial D. If you have ANY interest in drifting, even if you wouldn't call it an "interest" but you just think it's something fun to do in driving games, you owe it to yourself to find an arcade near you that has this game (version 3 is best).
Left 4 Dead. Best zombie apocalypse game ever.
Call of Duty 4. The roller coaster of FPSs. Nothing fancy or innovative, just non-stop adrenaline for about 6 to 8 hours.
Homeworld. Kharak is burning ;_;
Bangai-O Spirits. It's a Macross Missile Massacre in the palm of your hand.
Contra. That game kicked my ass and I loved every minute of it.
Mega Man 9. I LOVE YOU CAPCOM, why does everyone else forget the "retro" in their retro revivals?
Elite Beat Agents. This game actually makes me want to get up and dance. That's scary.
Anyway, please note this isn't my whole list of favorite games, I skipped a lot of games that are even better than what I listed, but didn't really "hit me like a ton of bricks."
linwolf said:
Final fantasy IX, there have never been a better RPG.
Really? Have you played them all? Have you played all the Final Fantasies even? I've played FFs that haven't even come out yet, FFs that aren't actually FFs, and FFs that will never legitimately exist, and I can assure you FF9 is squarely (hehehe) middle-of-the-road just by FF standards.