I've been playing quite a few games lately, so I'll just throw out some quick thoughts on each (most of which I've beaten by now):
Marvel Pinball - The tables could use a bit more variety, 2 of the 4 are too claustrophobic for my tastes (Wolverine and Iron Man), and Blade was lame to begin with. Still, the physics in play feel very good and the tables themselves are well-constructed and fun to play. Highly recommended.
Costume Quest: Grubbins on Ice DLC - It's more Costume Quest, which means more critically overrated and extremely average RPG gameplay, without anything akin to the level of humor you'd expect from a Double-Fine game. The new costumes aren't all that useful until you reach the final boss, and there really isn't anything approaching gameplay variety in this. Still, it's decent enough.
X-Men Arcade - Nothing special (outside of the hilariously bad dialogue and voice acting), especially since you have unlimited lives so you can just spam your Mutant Powers continuously and beat the game in less than a half hour with no negative consequences whatsoever.
PAC-MAN Championship Edition DX - Surprisingly awesome, considering I'm not the biggest fan of the original Pac-Man. It's fast, it's fun, and it makes all the right gameplay tweaks to make Pac-Man relevant for a new gaming era.
Epic Mickey - Needed Voice Acting, a competent camera, optional tasks other than endless fetch quests, more "forgotten" Disney attractions (most of what's here not only isn't overlooked or forgotten, but is still in active service in the various Disney parks), less tedious back-and-forth through the 2D platforming sections, and the ability to backtrack so you can explore. The sense of choice is good, though, I thought the game looked good for the platform, and the paint and thinner mechanics work well when the game lets you use them. They should have ditched the combat entirely, though. It just isn't interesting.
Assassin's Creed: Brotherhood - The best Assassin's Creed by far, with the focus on one smaller city and various gameplay tweaks that dramatically speed up progression and make the player feel more like an assassin. The missions are getting increasingly stale, though, and the plot has long since lost any sense of credibility it might have had due to the endless barrage of conspiracy theorizing and the sense that the writers are just making the story up as they go along. To be frank, despite Ubisoft's rush to milk this series to death with yet another Creed game next year, this franchise needs to rest for a few years and return with a new design document, as it just feels like it's spinning its wheels with marginal improvements. I did not have a good experience with the online multiplayer, which shows promise but I had severe technical issues with.
Super Mario All-Stars: 25th Anniversary Edition - A perfect symbol of the complacency and laziness Nintendo has started to show in recent years: the game itself is fine, but it shows exactly zero effort in the porting from SNES to Wii and the packaging extras are lamer than expected. It's not even the version with Mario World that was released a year later with the tweak to Luigi's sprite. It's a pure nostalgia cash-in that I can only recommend because Nintendo will never put the game on the Virtual Console so long as rabidly nostalgic gamers will line up to pay $30 for a $8 SNES ROM.
Dragon Age: Origins - Not my thing. The game world just feels incredibly generic, and the gameplay looks like it was lifted from a 15-year old PC game (which, considering this was made by the creators of Neverwinter Nights, it probably was). There's probably something wonderful in here for people who can get into it, but it's just not for me.