I don't understand you people. We have our exchange operating for several months, with a team of 6 people working on the software. TradeHill, Bitcoin7, bitomat, CampBX are all much more professional than mtgox too...
And yet mtgox with super shoddy security (it's not even funny), many problems and people still stick with them?
Blame yourselves. If you want the situation to change then vote with your $$$, otherwise things will never change. Frankly the situation is a bit ridiculous.
Hmm. I wouldn't hold Britcoin up as an example of the way things should be done. The site design and navigation are extremely poor, as are the trade input screen, trade execution summaries etc. The trade input screen overwrites your input prices, doesn't let you input a price per bitcoin forcing you to do side calculations, and has no confirmation screen. Way too easy to input a bad trade.
The order matching algorithm has a bug that causes parts of certain trades to happen at silly prices, and reports of this are ignored.
The exchanges will get better, but only through competitive pressure. I don't think any of them are particularly professionally done at the moment.