Sorry about the delay, I was busy with Star Wars Battlefront. Fighting against imperial walkers was cool, but it doesn't let me ride them. That's disappointing. I did manage to get through several more levels in Doom 3. I'm thinking it got easier after overclocking the video card a little. Now onto some classic + handheld recommendations!
GBA: Pokemon Fire Red/Leaf Green, Castlevania Aria of Sorrow, Wario Ware Inc., Sonic Advance 2, Boulder Dash EX, F-Zero Climax (import only)
NES: The Legend of Zelda, Super Mario Bros, Mega Man (any)
SNES: Tetris (any), Super Mario All Stars+Super Mario World, The Legend of Zelda A Link to the Past, Gradius III
Atari 2600: Donkey Kong, Pitfall II, Keystone Kapers
Dreamcast: Sonic Adventure 2, Wetrix +, Bust A Move 4, Crazy Taxi, Power Stone
C64: Risk, Boulder Dash, Test Drive II
That's not all! I've still got more games for you to go out and play. Come back again.