I used Etherdelta first time, it was very hard. But after I get used to it I never stop trading there. It's too easy and have full of opportunities.
No but there are orders that you can't fulfill anyway, so they are illusions.
You can only fill an order the size of yoru balance, but Etherdelta currently allows 5 open orders in a market ignoring your balance.
So if you have 100 ETH balance, you can put it in 500 ETH buy orders in a currency as fake volume, but only 100 will be executed anyway, and then the other orders get removed. But while they are on, it creates the illusion that there is a big buy demand, when in fact it's not.
So yes this bug has to be fixed eventually.