i've had it since it released last tuesday and i love it. i have been enjoying it more and more as the days go by. i played wow for 3 years, and i find this game to be more fun.
pros: runs on unreal engine so it plays well even on low-end computers, character customization is very in-depth, you can create a quick character using a template from a favorite character if you want to jump right in (i did this and made a bane character since he's my favorite villain), you can level to 30 quick so you are right into the end-game content (which there is plenty), the two cities gotham and metropolis are HUGE, feats and achievements galore, instances are a blast, pvp is really fun, and i'm sure there is more.
cons: the skill bar at the bottom of the screen is limiting (you can only have 7 abilities at one time and a consumable), mouse usage is lacking (the targeting system in the game is annoying at times), only 30 levels on a release game (i'd have done at least 50), and running into super heroes/villains is frustrating if you are alone (they knock you out in 2 or 3 hits).
overall, it is a really great game. it feels really polished and there is tons to do. i don't think you will regret purchasing it.