This is the way a sequel SHOULD be done... it keeps the base features of its predecessor while managing to make everything feel crisp and new. New decks, new game modes, new characters... More multiplayer-geared games should take a cue from MTG's approach.

Mass Effect multiplied by awesome.
Loved the return of ME-style humor. There are several things that 2 has less of than 1, such as assignments and items. The payoff is that this allowed them to make each one more unique, whereas in 1 they tended to follow a format. I especially found the additions of planet-scanning for resources and character-specific loyalty missions to be a special treat, and the final mission was an AMAZING challenge.
Also, Tali romance. :D

I started out truly wanting to enjoy this. I figured it'd be perfect for me. It's got nine different, specialized character classes, each with their own abilities and weapons, it has an insane number of achievements- perfect for an achievement whore such as myself- it has plenty of game modes to pick and choose from... unfortunately, all of this seems to have been put on a back burner in favor of collecting things... mostly hats.
Despite it's many seemingly-redeeming qualities, not even they can make up for the overwhelming focus on unlocking hats and the apparent lack of good sportsmanship.