We saw Sweeney Todd yesterday; it was pretty much what you'd expect. I appreciated the production and direction, but don't really feel like I need to ever see it again. I think I read that they cut it in length from the musical; I can't really imagine it being any longer than it was. (I am not a big fan of musicals).
The Metacritic seems about right, but I'm not sure this movie is so much better (or all that different) than Sleepy Hollow. (or anything else with at least 2 of 3 of Tim Burton, Johnny Depp and Helena Bonham Carter)