Hmm lets see I don't remember any games that really sold me.

Atari 2600 - My parents gave it to us.

Intellivision - It was the new system lol

Atari 7200 - No idea why.

NES - same lol

Sega Genesis - I don't remember but I never wanted the SNES

Sega Saturn - All Japan Pro Wrestling

Dreamcast - Soul Caliber

Playstation 2 - Free from a shopping spree

Xbox - Soul Caliber 2

Xbox 360 - still waiting for something to give me an excuse, bought it and returned it.

PS2: Katamari Damacy

And... that's it. Not a big console gamer.

NES: Super Mario Bros
Genesis: Golden Axe
Super NES: Street Fighter II
Lynx: Rampart
3DO: Need for Speed
Jaguar: Tempest 2000
N64: Pilotwings 64
Playstation: Ridge Racer
Dreamcast: Hydrothunder
PS2: Time Crisis 2
Xbox: House of the Dead 3

Dungeon Lords for the PC convinced me to buy a PS2.

I got sick of PC games getting released despite the fact that they were incomplete, as the company would decide that they could just patch it later. Dungeon Lords was the last straw. I bought the deluxe version and encountered a bug where the game would crash in the first dungeon. I researched it online, hoping it had been patched. Despite it being out for a year, the bug was still not fixed. I took it back to Best Buy, demanded my money back, and went and bought a PS2.

Same game for me too.

As for the PS2 and GameCube I didn't need a game to give me a reason to buy either of those consoles.

Xbox - Splinter Cell

SuperFamicom (NES): None, my uncle gave it to me as a gift with Contra.
SNES: no games in particular.
Playstation: got it at launch.
Dreamcast: Soul Calibur, Resident Evil:Code Veronica
N64: Mario 64
GameBoy Advance: Castlevania:Circle of the Moon. (My sister lost the GBA)
Playstation 2: no games in particular.
NDS: Castlevania, Advance Wars Dual Strike

NES - just wanted it, but Super Mario Bros. helped
SNES - just wanted it, but Super Mario World helped
Gameboy - just wanted it
Playstation - Final Fantasy VII
Dreamcast - Utopia Boot Loader :\
Playstation 2 - Final Fantasy X and Gran Turismo 3 bundle
Gameboy Advance - Castlevania Circle of the Moon
Gamecube - Resident Evil remake and price drop
Gameboy Advance SP - price drop
Xbox - gift when it came out, but would've been Halo and DOA3

I was never convinced to get a N64. I am still not convinced to get a DS, but I think I will when the Lite comes out. PSP lacks good titles. 360 is too expensive for me, and also lacks titles. Maybe I will for Halo 3.

Nintendo: Super Mario Bros. 3
Super Nintendo (bought this on launch day): Super Mario World/Legend of Zelda 3
Sony Playstation: Resident Evil
Gameboy: Super Mario Land 2
Sega Genesis: Sonic the Hedgehog 2
Nintendo 64 (bought on launch day): Pilot Wings/Mario 64

Not that I paid for those. That was a long time ago.

I don't remember the others. Newer systems had none of the hype for me (with launch titles I mean). So, I bought them as various things I wanted came out... I dont even remember anymore.

I guess I used to be a Mario whore back then...