I watched this on DVD for the second time the other day. It was on at my local cinema but I never found time to watch it there. It isn't really that bad actually. It made me want to watch Moon again straight after. I didn't though, because the second time I watched that, it wasn't anywhere near as good as the first.
I wonder if it was just my expectations being low and my open mind when watching it that led to me taking Apollo 18 as fairly passable?