PS3 - Valkyria Chronicles
360 Tales of Vesperia
Wii - Madworld

PS3- Folklore, Heavenly Sword, Siren, Valkyria Chronicles

Halo 3.

PS3 - Valkyria Chronicle
X360 - Blue Dragon
Wii - No more heroes

If you include PS2 I will say Persona 3/4 is the most under appreciated game ever

Wii - Super Paper Mario
360 - no idea
PS3 - mlb 09 the show (such a great game)

Wii - No More Heroes (I haven't played this game yet, but I know it's truly a underrated Wii game)
360 - Can't think of a game other than Halo 3...lol
PS3 - By far BioShock is a underrated PS3 that every PS3 owner should try out!

PS3 - Genji: Days of the blade
Xbox 360 - Shadowrun
Wii - Wii Sports.

( Can't think of a Wii title.)

DS - legend of Zelda phg, Mario and lugie partners in time
PSP - mlb 09 the show, ratchet and clank size matters

360 - Halo 3...not a joke... So many people trash it but its always there providing fun...like a trusty old dog serving his master.

Wii - Mario Strikers Charged

Underrated games that I can think of:

1) folklore/folksoul- it is a greatest hit in Japan but not anywhere else. This makes me sad because it had beautiful graphics and a cool story.

2) Lair- I was one of the few people who actually like lair for it's art style and easy to use six axis controls. I actually finished the game and have not traded it in.

3) Bioshock ps3- My goodness the game came with better graphics, all the dlc, and got an exclusive dlc map to boot. Still sold like it was some mediocre game.

4) V.chronicles- Best Srpg this generation hands down, beautiful graphics and soon to get three dlc's in june. People did not pick this game up and this made me sad.