I had no idea who Zak Penn was so I just looked him up on IMDB. Out of all the movies he's written, he's only had 3 that sucked (X3, Elektra, F4). I don't think that's enough to say that he's a horrible writer. I personally loved TIH and Behind Enemy Lines and laughed my ass off watching The Grand. Nobody's on their game all the time.
I also have never heard of Josh Schwartz but I'm a big fan of Chuck and I've never watched The OC and GG but they're both successful shows about teenagers, which is what this movie will be about, so I don't see the problem there.
Brett Ratner is a hack. Everything that dude has been ****. I liked Money Talks when I was 12 but I can't imagine I had the best judgement back then.