I saw both The Dark Knight and Mamma Mia! (and, no, I didn't sing along). I did like them both quite a bit, to be honest.

With TDK, all of the hyperbole, I think, is pretty justified. It really is one of the best "Hollywood" movies I've ever seen.

MM! was a different sort altogether and I sort of wish I saw them back-to-back (w/ MM! right after TDK). The premise is flimsy (one comment I read on Rotten Tomatoes said something like they were unsure why the idea of DNA testing was kept from Sophie). None of that really mattered because everyone on-screen and everyone was having such a good time that the plot/script problems were gleefully swept under the rug.