If developers try to do too much, their games get weakened. It happened with KotOR2, and now we're stuck with tons of bugs and a weak ending (though overall the game was very good). Morrowind walked itself into the same problem when it created a huge world to explore, and then didn't put anything interesting inside.
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Although Morrowind was lacking in interesting content 110% of the way. That was why it was great. It was like real life (in my head) As in real life you sometimes have to do something yourself.
BUT OBLIVIONIS GONNA BLOW YOUR PANT OUT YOUR @$$ and that is why they should do a starwars game using thier sweet engine.