Worf didn't really get much of a chance at development until "Heart of Glory", which was really Vaughn Armstrong's show. There's that scene where Tasha overreacts to a perceived hostage crisis. After the Klingons are escorted off, Yar says to Worf she thought there was going to be a problem. And Worf gets a really pathetic line in reply: "Oh?" I don't think even Stewart could have pulled that one off convincingly. It was an important show for Worf, but the writers still hadn't found his voice.
But Dorn did really well in the final confrontation scene in the engine room.