Iaon Grufford's acting was atrocious
I actually enjoyed the movie, I thought it had some pretty intense scenes, in particular the first death scene. I thought it captured both characters' frantic instinct to save themselves by letting the other person drown.
But I thought Ioan Grufford's acting was just bad. Not at all what he's capable of. I'd put his acting near the bottom of the cast, behind the actors who played Victoria and Josh. There's no excuse for that considering he's the star actor in the movie.
He's obviously a great actor, look at Amazing Grace and King Arthur. He even did ok in Fantastic Four. In this, he was just awful though. I gotta blame the Director on this one. We've seen bad directors make decent actors look terrible before (George Lucas in Phantom Menace) and this seemed like no exception.