Oblivion is an excellent game. I must admit I haven't played Morrowind much, I got bored. I've got about 10-15 mods running and it's made Oblivion so much fun to play. If you haven't bought it yet, it really is worth it, I'm 100 hours in so far and I can't see an end just yet. I bought the official guide to go with it and just flicking through that there are hundreds of quests I haven't completed yet.