are they scammers - or just some problems?
That's anyone's guess right now.
(edit: My guess is no, they're not scammers.)
does mtgox have problems? YES
could they have dealt with those problems better? YES
does their comunication suxx? YES
are they scammers? ABSOLUTELY NO!
as far as i know, there hasn't been a single loss of customers BTCs or fiat. mtgox doesn't hide in the dark or operates more or less illigal like btc-e and bitstamp. i wouldn't trust btc-e at all! even bitstamp doesn't earn more trust, than a few coins, you can afford to lose!
the only really trustworthy exchanges i know are
www.bitcoin.de and kraken. next in line is mtgox and after that nothing for a long distance! if you want to trust btc-e over mtgox, fine! but prepare to see the operators running with your money. nobody knows, who they are!
edit:mtgox had and still has lots of serious troubles but they are still there and never took any money. most exchanges who are operating today never had any problems. those who did are gone. more often than not with their customers funds