Seriously, they've just been doing 'more of the same' since the first expansion. There as the first game, then three expansions, two of which I played, and all three did the exact same thing. F.E.A.R. was amazing, but there was only so much of that game I could consume.
Then I had a look at F.E.A.R. 2 and it was again more of the same... so I mean a whopper can be a delicious burger, but at some point you want to try something else, or at least you don't want to see the whopper as the whopper 2.
I know, I know, F.E.A.R. 3 could be very different, and I may actually get it from the bargain bin, but my concern for this game is exactly ZERO.