I think the romance between Eleven and Mike was unnecessary. But maybe that's just me. I don't need romance between every male and female character and it would be enough for me if they "only" had this really strong friendship. Friendship can be just as strong as love.And I hated to see Nancy back with Steve. It was so unexpected and felt absolutely weird. I don't know why the writers chose to do that. I'm not saying she should've been with Jonathan immediately because that might've been a bit too much of a cliché, but I don't really see or feel any connection between Steve and Nancy.
But besides my complaints it's a good show so far. I heard multiple people say how good it is, but I didn't really expect too much. After the second episode I was kind of hooked, though. Now I'm excited for season 2 :)