uff, very good question. its very mixed really, but if i need to consider the movies I enjoyed most watching for the first time it must be something like:
Avatar
this movie amazed me, and with the "new" 3d at the time it was an amazing one to see.Avengers
a bunch of superheroes together, that was too cool!Fast and Furious
I think the fast and furious series is very good entertaintment, and they are also watchable for another time, more specificly the older ones, I dont think the newer ones has much to do with cars anymore but still entertaining.
As I really love movies, its pretty difficult to set a top3 but thinking fast this was the 3 that came to my head firstly, and there must be a reason for remembering them first :)