I finally got around to seeing this, and all I can say is "meh". I wasn't expecting a lot already, but thought it might be enjoyable enough fair after reading what Total Film had to say about it ... I did get some moments of entertainment from it, but over all I really can't remember too much about it, or nothing really properly worth remembering anyway.
I guess I would have much preferred to see the original R-rated version those behind it had in mind, I think that could have really provided something fresh and different to the super hero action sub-genre. Instead, we get quite safe fair (I wouldn't say having him mutter "fuck" once, shove a head in an ass and be a bit hung over at the start - before a swift-to-come clean-up as daring territory).
As for the twist - it's pretty obviousy pretty damn soon, and I wasn't exactly fussed...then again I wasn't fussed about the whole movie. Worth a watch, but I could easily not watch it again.
Now if you don't mind, I fancy watching the "Last Day" trailer for Gears of War 2 yet again - now that shit is top notch!