Here's my current list, could be changed once I finally get the chance to buy Mario Party 3:
1. Mario Party 7 (GCN) 2. Shrek SuperSlam (GCN) 3. Perfect Dark (N64) 4. Goldeneye 007 (N64) 5. 007: The World Is Not Enough (N64) 6. Super Mario Galaxy 2 (Wii) 7. Super Smash Bros. Brawl (Wii) 8. Donkey Kong 64 (N64) 9. Banjo-Kazooie (N64) 10. Mario Kart Wii (Wii)
Honorable mentions: Mario Kart Double Dash (GCN), Shrek the Third (Wii), Super Mario Galaxy, Super Smash Bros. Melee and Mario Party 6
My list is in no particular order as i'm bad at choosing favorites
1. Mega Man 2 2. Super Smash Bros. Melee 3. Fallout: New Vegas 4. Super Mario 64 5. Undertale 6. LEGO Star Wars: The Complete Saga 7. Civilization V 8. Tetris: Ultimate 9. Project M 10. Shrek SuperSlam
Honorable mentions include Team Fortress 2 and Terraria
Pokemon Xd: Gale of Darkness Dragon Ball Z: Buu's Fury LSD: Dream Emulator Age of Empires II Pokemon Crystal/Emerald (it's sort of a crapshoot for which I prefer on a given day) Kirby 64: The Crystal Shards Shrek SuperSlam Diddy Kong Racing Kingdom Hearts 2 Kirby Air Ride
Smash 4 and Undertale are both probably gonna end up on here but they're too new to say for sure. Mario Kart Double Dash and Animal Crossing Wild World are worth mentioning just because of the insane amount of time I've played them.