Absolutely not. Mt.Gox, Mintpal, Cryptsy, BTC-e ... you just never know. It just hits you when its too late. Now, having said that, same stuff happens with regular banks. And crypto exchanges are evolving like mad, and with more regulation come more safety. It is crucial you know your exchange and what liability they have to hold custody of your assets
you said it the best way. i learned from my mistakes before not to put too much funds on exchanges. i was there when mt.gox and btc-e collapsed. there are some exchanges and web wallets that offer very high interest to its users. be careful of these sites as it may run away with your funds.