Recurring downtime, transfer delays (which seems mainly to be solved now), and most importantly, lack of regular communication.
Goddamn it, and
engine bugs that mean you're being robbed. I am stunned that people aren't really furious about this!
I am, but what can you do other than leave bitstamp? If you piss them off enough I'm sure they will find a way to run with your coins as this is an unregulated pile of shit.
I was essentially robbed for a few hunderd dollars yesterday evening.
As I said before, Bitstamp can suck a fat one.