Amazing Spider-man: Mostly echoing Shale, the main thing that got me was rehashing the Origin story, not in how they did it, but rather given the Raimi movies are still quiet modern, most people know Spider-man's origin story, so devoting nearly half the movie to the origin story felt off. Not that this was badly done or anything, more saying I felt they probably should have abbreviated that (maybe even montage'd it?) and then devoted more time to the actual meat of the plot.
Other than that, good stuff. Different take on Spider-man, but worked out pretty well, and that's all you can ask for. It is nice to see Spider-man actually acting like Spider-man (namely the quips), which is especially notice-able after reading a good deal of USM, and seeing the series Spectacular Spider-man, and yeah, sequel should be interesting.
Also, is it wrong that, ignoring the existence of X-men Origins (probably a good thing), this further shows how X-men and Spider-man as movie series are quite parallel? Observe!
1st Movie: Good start to series.
2nd Movie: Sequels that surpassed the already good predecessors
3rd Movie: Dramatic drop in quality compared to the other two (to be fair, Spider-man 3 was more just "mediocre", while X-men Last Stand was...uhh...significantly worse than "mediocre")
Reboot/Prequel/Etc.: Different take on characters, lore, etc. of the other movies, but generally well done and back on par with the good parts of the previous series.
EDIT: Oh, one major flaw of the movie?
No JJJ