I like competition, so I'm not seeing how this is a good thing, unless one stands to gain profit from the movie. I would've liked to see Transformers go head-up with FF2...just to see which one people wanted to see on opening weekend, and whether they went back to see it again, or to see the other one, or something else.
If Transformers is going to be good, then I'd like to see people going out in droves to see it...as a result of good word of mouth after the early showings. If it's NOT going to be good, then I'm not going to be excited that it makes a huge profit because there were no other new movies out on it's opening weekend.