FlashForward has to live up high expectations since blogs and ABC called it "the new LOST". Sadly, it doesn't. I don't really know how to describe it - the idea of FlashForward in general is great, the actors and everything is great, but I didn't get that one feeling that ties you to the show like I had after the first two episodes of Lost or 24.
Maybe this will change in the upcoming episodes, but I just have problems believing that the whole mythology is "realistic" But let's wait and see if the writers will turn that around. The show has potential - it just needs to be used right.