I'll stick with current-gen ok?!
Wii:
Zelda TP: Only great launchgame besides Wii Sports.
Super Mario Galaxy: It's Mario.
Brawl: Want good fighting games?! Here's your chance.
Mario Kart: Online, co-op, timetrial, timesharing... Mario Kart + online = killer.
No More Heroes: I like Suda51.
The Godfather: Blackhand edition: Great controls, liked this game very, VERY much.
SSX Blur: Great snowboarding franchise exclusive Wii version = must buy!
Wii Sports: Pack-in... Fun game, while it lasts.
Guitar Hero 3: Great music game.
Mario Strikers Charged: I think it's more fun then Fifa or PES, eehrm... I live in Europe, so!
Metroid Prime 3: Ending of a great trilogy!
Table Tennis Wii: Support Rockstar's Wii games, also... Quite a fun game, only cost me 20 euro's.
Super Paper Mario: Haven't touched it but got great reviews, eehrm... Gamecube game was awesome!
Wario Ware: Lol, eehrm... Lack of great games after launched caused me to buy 'good but not so great' games. Still fun though!
PS3:
The Orange Box: Game got great reviews, this version was supposed to have framerate issues, EA released a patch... And the game is so good it doesn't bother me! Best game i.m.o for the current-gen!
Call of Duty 4: Best FPS available (not arguable, just The best!). Great reviews, great online etc...
Assassin's creed: Hype, and needed a game when I got my PS3...
GTA4: Duuuuuh...

THE NETHERLANDS







