I'm still riding the high from having seen Batman Begins, so I'm in a good mood and I'll be optimistic about FF. For now. :-)
Of course Fantastic Four will be completely different in tone from "Begins" (as it should be) but it remains to be seen if it will manage to make us actually care what happens to the characters. Avi Arad keeps proclaiming that there won't be a dry eye in the house by the end of the movie, but I'll believe that when I see it.
Summer has arrived... onward!