In my personal opinion, I still think it was. There wasn't much originality in it. Yes, it had a good storyline. Most of the actors were great. Ovverall, a good movie, but it is comparable to most other alien movies out there.
Bad movies that make no money and critics hate are not overrated, that's basically the opposite.
A boring indie French movie in Black and White movie that get an Award in Sundance is overrated.
You can watch overrated movies reviews in from Confused Matthew, check out his reviews of 2001 A Space Odyssey, Titanic, and The Lion King, he really hate those movies.
I'd say "The Avengers" is quite disapointing, considering all the fuss it created...