Please tell me LeFay was head of the Morrowind project...
No, IIRC.
Hm. I have never played DF, but its not that difficult to inform oneself about it, and it seems to have some interesting concepts. Still, I think the main change MW made (from randomly generated terrain to set terrain in a miniaturised world) was necessary. With rising tech levels, randomly generated generic dungeons just wouldnt cut it anymore. Hence I say Morrowind for the first question.
The second, err - OB wasnt as bad to be considered least good. I mean, at least it did have some good quest lines. Arena - well, I havent played that either

As for the third question, Howards having said that creativity and originality are BAD things pretty much settles the question in favour of Julian.