Favorite Elder Scrolls Game?

So what is your favorite elder scrolls game? Personally I've played Morrowind, Oblivion, Skyrim. I'd have to say my favorite is a close tie between Morrowind and Skyrim. Each one did different things right and certain things wrong. For example in Morrowind the guild system was very complex and dynamic. That's one of the reasons I like it. In skyrim the graphics are pretty great and combat is very smooth and fun. I'm interested to hear what people think!