I really wanted to play Gears 2 and 3, but 360  sadly was never a console of my choice. However  Uncharted, Killzone and  God of War did manage to make up for that loss.

Great to me anyway

360: Infinite Undiscovery

Wii: Deadly Creatures

Many on the PS3.

FF XIII-2.

Valkyria Chronicles.

Dragon Quest.

Ico and the Shadow od the Colossus. 

Some more that I can not remember......

The legend of Zelda, I've played and loved many Nintendo games and consoles but for some reason I've never played a Zelda game.

I've played most major 360 exclusives as well aside from Forza 4, really wanna try that out but none of my 360-owning friends have it :( Oh and I also haven't played GOW3, it's a shame since I really like that series, sadly my 360 died just after 2 came out.

I love 2D Mario so the NSMBWii (?) I would like to play, even when Nintendo has fucked the difficulty so that little kids and adults, pretending gamers, can actually play, SM3's last World, those were the days.

Also Gears Of War always looked cool.

Last Story as well. However, none of those games justify buying said consoles, not for me.

None, owned all 3 consoles up until last week. And the remaining exclusives for PS3 that have still to come out I'll just play at a friends house.

Crackdown for 360. That game looked like so much insane fun, but none of my friends own it. :( Also, several PSP games (Tactics Ogre, Legend of Heroes, Ys, Birth By Sleep...).

Wii: Super Mario Galaxy 2, luckily played the first one before I sold the thing. Also Xenoblade.

360: Lost Odyssey, Tales of Vesperia and Raiden IV.

Only game I can think of is Crackdown 1... and I played it a lot with a Friends X360

I keep not playing Zelda: Skyward Sword, Mario Galaxy series and almost any Wii game because the HD twins keep giving me gems. Since it looks like a slow summer and fall gaming wise I am sure I will finally play at least Zelda.