I didn't find it fun at all. Halfway into the thing I found myself thinking "is this it? when is it going to get good?"
SPOILERS BELOW
I didn't even go into it with a bad attitude, I honestly didn't like anything about it. I mean, the scooby doo-gang was completely uninteresting because their characters were supposed to be silly I guess, which doesn't add anything to the film. On top of that, they're being taped by a bunch of dicks, which removes any tension or excitement from the film. So what's left? Only the idea that it's a fresh new take on horror films or whatever Joss Whedon was going for. It was pointless to me.