It's difficult to make a realistic assessment on this site, as there are a lot of obsessive fanboy types (who judge/nitpick harshly, see films they love multiple times)...and also a lot of people involved in the movie business, either through working at cinema/theater chains, or in marketing departments or other promotional involvements (so they hype things up).
It's true that we have had a lot of 'big' films released close together. If they were more spread out, they wouldn't bite into each other so much. Some people just go randomly to the cinema, and pick a movie when they're there - so if there's something new, they will opt for that.
Having said that, I'm the only person I know (off this site) who sees any film more than once. NO ONE else I know in the real world goes back to see ANY film again, even if they loved it. And there are people i know who don't rush to see a movie either - my co-worker Marion saw Wolverine on its second or third week, there's a guy at work who is a real superhero fanatic yet, because of his work hours (he's a sports writer) it takes him weeks and weeks and weeks to get to find time to see a movie.
What I've seen in the real world is this: First weekend of Wolverine was packed, audience seemed to like it. First weekend of Star Trek - not that packed at all, not a lot of laughs either. Star Trek at IMAX (on its second weekend) - totally, absolutely packed and heaving with people, massive lines of people, sold out performances, people loved it, a total 'experience.'
Went back to see Wolverine at normal cinema, was very quiet, but large crowds going to Star Trek - even saw a group of older people (in their 60s or 70s) outside in the car park trying to do the Vulcan salute! I so wish i had a camera with me.
Those individual experiences seem reflected in Wolverine's relatively high opening weekend, Star Trek's solid but lower opening, and Star Trek's stratospheric IMAX ticket sales and good legs.
I think Wolverine should have been in IMAX, but it wasn't. (I saw all three X-Men movies in IMAX at an all-night screening in London, brilliant!)
Fox did say they lost $20million on Wolverine through the film leak, which is probably about right. We've had no update on whether anyone has ever been caught for this
Variety also said at one point that box office this year was 7 per cent higher than the same time last year, or something like that. But maybe it's no longer higher than last year.
Terminator Salvation has limited appeal, and I'm really not sure about Transformers, but i expect Harry Potter to be another big family draw like Star Trek. Transformers is going to be boosted by IMAX.