I really liked the way the story lines were a reverse parallel, with one character starting at the end and working backwards, and the other starting at the beginning and going forwards until they converged.
I liked the way the plot didn't go with the usual romantic clichés, but added some complexity to what could have been just another boy meets girl story.
The music wasn't overly memorable, but there was a clever catchy quality to the lyrics much of the time, and the tunes were sufficiently serviceable to not detract.
BUT...why oh why do directors use such fakey lip synching? I really think it would be far better to use live singing, even with an occasional flaw (as, for example, was done with Les Miserables, which took real guts given the scope of that film!) I understand that the actors did at least do their own singing, but still, the lip sync makes the inherently unlikely format of a musical frequently seem silly--and I am actually a big fan of the old, classic musicals like The Sound of Music, etc.
Also, it was so obvious that they were not actually singing at those moments, because you HAVE GOT TO OPEN YOUR MOUTH to make those sounds! Finally, and this may just be a personal (lack of) preference, but I found Anna Kendrick's voice to often have an unpleasant, fingernails-on-chalkboard edge to it.
