Kirby: Return to Dreamland (Wii)
Why it was over looked: Wii game, released in the middle of the "big fall lineup", cute visuals, not as "unique" as last year's game (Epic Yarn).
Why you should play it: Because it's classic Kirby gameplay, and allows for up to 4 players-coop + 2D gameplay, powerups, bosses, and *SPOILER ALERT* the first boss is Whispy Woods.
Skylanders: Spyro's Adventure (Wii/360/PS3/PC/3DS)
Why it was over looked: At least of GAF, because of: this is not Spyro, cute visuals, toys, Spryo's face,...
Why you should play it: The consoles/PC version is technically Gauntlet: Dark Legacy with a new visual style; while the 3DS version is a classic platformer akin to the original Crash games. During the game you level-up your characters, raise their stats, ..and yep, collect hats too. Info is stored in the figures, so you can transfer and continue playing with anyone, no matter the version. Plus, you don't need to buy all figures to play much less finish the game.
Motoheroz (WiiWare)
Why it was over looked: Wii-digital release, not wanting to pay $15 for a digital release
Why you should play it: Anyone that liked/played Trials HD should play it. Heck, it is fromthe same developer (Redlynx). There's a single player mode and a multiplayer mode..that can be played online (well, at least exchanging/beating scores in a leader board...no actual multiplayer). There are possibilities of DLC, but..well... more people need to buy it first.
F.A.S.T. (WiiWare)
Why it was over looked: Wii-digital release, from an unknown developer; released to little (if any) hype.
Why you should play it: Is a mix of: Wipeout + F-Zero [i.e. speed, loops, futuristic design, ground energy] + Ikaruga [black powerups can only be used with the ship in black, white ones with the ship in white]