Watched 'World's Greatest Dad' last night and wow... I was not expecting it to be like that
I literally knew nothing aboutt he film before I watched it apart from the fact Robin Williams was in it, but I really, really enjoyed it. I felt the concept impanted in the film was was really original and just plain interesting. Sure, the second act does a little too much with too little but theres way more good than bad, so it balances out really well.
I'd definately recommend watching it, and if you do, try to avoid reading up too much about it beforehand.