Each to their own as we all have certain things we do and don't like. For me, I loved Morrowind, Oblivion was okay too, but I love my RPG games. Skyrim was good, but they messed up with the level up system.

Fallout 3 was my favourite and then New Vegas was a great game too (which I am starting to play again as I don't have 3). The surviving in the wasteland, post-apocalyptic world is one of my favourite scenarios and there was so much enjoyment the games provide for me.