Mintpal can be annoying too.
Takes forever to get withdrawal email confirmation.
Then one gets this message on deposits:
Polite Notice: Please do not mine directly to the deposit address and / or auto withdraw from pools. Please aim to deposit at most five times an hour, exceeding this limit could lead to your account being disabled.
Yes, I get the problem with deposit spam, but disabling account makes the exchange unusable if one wants to have peace of mind (even if I don't deposit like that), and opens the door to arbitrary bullshit. They could just charge a fee for such deposits, and it would be fine with me.
They dont want people to mine directly to their wallets at Mintpal cause it clogs shit up on their side, if you dont understand that and are to lazy to install a wallet on one of your own computers or set the payout from the pool/pools high enough so you get less then 5 payouts / hours i really dont know what to say.