well...i'm not quite sure what to think yet. i guess i'd like to have some more information....at least they've kept the same director - hopefully they'll have a good script!
I've enjoyed each of the three other movies, and each had its own mood and flavor, IMO. I can't imagine Gibson having made as much money as he has in his career and risking his pretty decent reputation on a piece of junk. Add to that a previous director signed on, and I'll bet this will be just as watchable. None of them have been cinematic masterpieces, of course, but all have been fun not only on first viewing but for repeats, too.