I thought it was "alright", watchable but instantly forgettable, Sly elevates it, but without him it would have been a pretty crap film. I honestly preferred Arnie's The Last Stand.
Still, it was worth watching just for the Rambo Vs Khal Drogo fight
On a related note, while i'm not expecting the new Die Hard to do too amazingly at the box office, i can't see it bombing. It'll make a hell of a lot more than Bullet to the Head, The Last Stand and Jason Statham's Parker. It's also funny how people seem to keep claiming that the Die Hard series is dying "a slow and painful death", the box office figures for the last one are the highest in the series (unadjusted, but even so...), hardly a franchise that i'd consider to be dying.