Enjoyed it!

I personally enjoyed the film. I appear to be the odd one out as most seem to hate it.
I found the film suspenseful and enjoyable.
I didn't see any problems with editing/cutting with the hand-held camera and such. I thought this added to the film. It didn't even dawn on me that there was any issue until I read the posts here.

As has been mentioned in the other posts, it can be a little ambiguous as to who the actual killer is. IMO, this ambiguity is part of the strength of the movie. American Crime as I'm guessing most tablopid type shows aren't necessarily interested in catching the criminals as they are in just reporting and sensatioanlising all the bits. I think this was captured quite well in the film. Why would American Crime want this to stop? Hell, I'm sure they had a great story with one of their fired employees being involved in all this.

I liked the ending and the overall feel of the film.
As for those upset not knowing for sure who the killer is, that's too bad. I think this capped off the movie beautifully. There are a number of movies like this. Sure it can be aggravating but in some instances, like this film, it can be a better ending.

Anyways, that's my 2 cents. Hopefully there are others out there who have enjoyed this movie as well.