Mr. Jones is a relatively fresh take on the found footage format, with an intriguing premise which involves the occult and has a Lovecraftian vibe to it.
As a horror fan, I was at least hoping for something interesting, if not scary ('cause I think found footage films lost their touch a while ago). Unfortunately, the film fails to provide any thrills throughout its brief running time, and ends up being very annoying (especially in its second half).
Mr. Jones himself is probably the most interesting aspect of the film, and manages to build up a bit of tension with his appearance, but whenever he goes offscreen we're back to a flat, suspense-free movie. Both of the main characters were okay and acted quite well, but they were given very little backstory, thus ending up being unsympathetic. But hey, at least they weren't screaming all the time...
Another good thing about the movie is its somewhat captivating first half which is presented as a documentary about nature (though switches its main subject to mr. Jones when the main characters become aware of his presence). But the second half betrays its found footage format and turns into a trippy, nightmarish mess. It's an unwelcome change of pace because it tries too hard to scare and fails.
Anyway, if you're planning on watching it, lower your expectations considerably or you will be disappointed. If you don't like found footage horror films, or trippy experiences, then I suggest you skip it.