I am a massive fan of DS9. It is easily the best series of Star Trek, owing to its vast number of recurring characters. I have read nearly all of the DS9 relaunch novels, and can't wait for The Soul Key to be released.
I thoroughly enjoyed Season Four of Enterprise, and was bitterly disappointed that it was cancelled, although I wasn't suprised because Season Three was awful. It was as if someone decided that DS9 was so popular, because a lot of it was semi-serialised, and doing that for Season Three would make it popular, not realising that Enterprise didn't have a strong enough character pool for this to work.