Sorry to quote my own crap, but after seeing the movie, this review is actually pretty spot on.
Basically, while the first movie was a tight little package, albeit fairly predictable...this one is a rambling, sprawling mess. At least 20 minutes too long. That's the bad news. The good news...it's kinda funnier. A lot more cutaway Family Guy stuff, and just some severely ridiculous moments(the opening song and dance number in particular), but in the middle of the whole thing...some realllllllllllly funny stuff. I was laughing pretty hard pretty much the whole way through. That makes it a win. I don't know if it has the same rewatchability as the original...but I can honestly recommend it with the caveat that you go in realizing this movie is, technically, a storytelling mess.
Few other thoughts, yeah...the attempts to parallel Ted's fight with great civil rights causes is borderline painful. There is an African American character in the grocery store who's use of the N word is extremely off putting. But Marky Mark is having a good time, and Amanda Seyfried, well...I didn't dislike her as much as I usually do...and she has a surprisingly good sense of humor because some great jokes are made at her expense.
And stay thru the credits.
Oh, Liam Neeson is f'n awesome. Just F'N AWESOME.