If you are going to sell your tokens on etherdelta, it means that the token is not yet tradable on an official exchanger so the selling price will be very low.
not necessarily, etherdelta is an erc20 exchange which means you can trade any coin as long as it is an erc20 compliant even if it is not listed there.
there are coins that are listed on some exchange but has a large trading volume on etherdelta because people love the cheap price there but the OP is right about its UI sucks and connection is way too slow.