I am a sci-fi fanatic and my all-time favorite is "ALIENS". My daughter teased me because I knew the dialogue for the entire movie. I even used some of the dialogue on my computer - for instance:
instead of the "beep" sound for error - my computer says "Get away from her you B----!" lol
Anyway..the best movies that I've seen this summer have been
"War of the Worlds"
I am chomping at the bits to see the Grimms Brothers, but the critics hated it.