Yep, agreeing to what Leo said, I watched it on 3D also, just because in my place, the price difference is just about getting the 3D recycleable glasses ...
.
This Amazing Spiderman - action-wise does not stand out like Michael Bay's movies (Transformers series, for instance). It's just powerful in story-line, it makes so much more sense on the reasonings, story flow and the kind of enemy he has. So it does not make a big difference whether you watch it on 3D or not, but that's just my opinion. I could name other movies that you definitely want to watch in 3D as opposed to the regular, but this movie is not one of them.