why i thought the ending was brilliant (spoilers - obviously)
The ending basically justified all of the shitty acting we saw in the first 3/4 of the movie - and even some of the unrealistic shit we saw, where the killer obviously shouldn't have been able to move around unseen and take out people as easily as he did.
We all saw the film 'Game' - where the acting from the 'actors' was perfect. This film removes this perfection and makes things a tad more realistic, by showcasing shitty acting from the pretenders.
Now, when I realized that this was another take of the 'game' - I did laugh a bit, but it's when they went for the practical joke within a practical joke - it was so unexpected that the dam broke and I started laughing out loud for a few minutes after the fact.
So, to me - this film served as a pretty brilliant and unexpected joke. In hindsight, the use of such shitty acting throughout the 3/4 of the film was ingenious. I was rolling my eyes, bored out of my mind - I think that's what made the ending that much more impactful. If it featured great acting like in 'the game' - with some really good action sequences.... the ending would be nowhere near as funny.