I wouldn't say crap, but the third act definitely needs work. Which from what it sounds like, they're currently re-shooting and doing some additional filming. Doesn't mean it's automatically going to be perfect though, but I have hope. Shane Black is a good writer, he really is, but he co-wrote this with Fred Dekker who hasn't done a lot recently. The dialogue was very 80's and 90's humour which doesn't work anymore. Shane Black has also said that while they were trying to figure out these characters they decided to just cast the roles and build up the roles around the actors. He's got a great ensemble, I think if you can make us care about the characters and give them some good dialogue so if and obviously when some of them start getting ripped apart we care.
But there are a lot of other things that need to be done right as well.