Expect? No.

Enjoy? Yes. I am always impressed when I see a mortal interact with a mob.

That said, I certainly think there's a point at which roleplaying with mobs is a silly exercise in talking to yourself (though I sometimes still do it when I RP with mortals, but I amuse myself easily.) When you are *with* other players though, sprinkling a little sayto with some of the NPCs as it might come up makes sense. I also love to see it when mortals take the time to seriously consider (beyond the 'consider' command that is!) how they should react to a mob. So maybe that peace-loving monk or the farmer working in his field IS neutral, but is your paladin still going to slit his throat for his shinnies? Yes, I know the Balator orphans are great experience at that level, but maybe your prim and proper Imperial James-Bond-esque assassin might not rampage around a village killing orphans all the same.

Some of this comes under Iunna's plea to *rp with each other*.

And I suppose I can't speak for everyone, but in my experience, leveling up or running around trying to gather gear is really tedious if you don't sprinkle some RP in there and have fun with it.