Apart from forkdelta, another great market for ERC20 tokens is IDEX. It is more user-friendly than forkdelta and has rarely any issues with transactions.
But on IDEX you can only trade 'listed' tokens, right? Or is it possible to trade a token where you only know the contract address and the token symbol, like at Etherdelta/Forkdelt? Because that's exactly the reason why I like Forkdelta that much. Sometimes you can make a real bargain when some bounty hunters wanna dump their tokens before the first exchange listing.