not to be harshed but i think etherdelta is one of the worst online exchages sites out there. there were many bad feedback and reviews of users around the net balantly accusing etherdelta because of poor service due to its buggy and verry slow interface, sometimes it also eats up your etherium balance without any valid reason, resulting for you to be clueless and ended up scratching your head.
Etherdelta has it's own cons and pros but I wouldn't call it the worst online exchages sites out there. I think many bad feedbacks and reviews are coming from not very advanced users whatsoever. Yes interface is slow and you can sometimes see the orders that are already dealt, but I use etherdelta for quite some time now and I never encountered the situation when etherdelta "eats up my etherium balance without any valid reason".