A) Agreed. That's all systems, though. And, to me, the Wii has enough must-have, exclusive titles to make it the one for me.
B) No, they can't. They can pretend to be. I own that. They're only ever passable, at best...relying heavily on style.
C) Subjective, really. We certainly don't enjoy the same games/genres. But I will say I don't feel driven by anything I've seen out of the other two to make them impossible to live without. I really don't want a PS3 or 360. I'm sure the games look nice, but...dunno'. I think I'm where I'm supposed to be.
D) Natal/Sony's Moon Dildo/The Wiimote are just options. At least, they SHOULD be. When anything gimmicky is overused (let alone misused), it's a bad thing, 99% of the time. It stops being novel and immersive, after a while. It's only natural when handled by TRULY skilled designers for unique applications. It's always why my Classic Controllers are almost CONSTANTLY plugged into my Wiimotes.
E) The soulless avatars would bother me. But I like time-killers, so...I'm not ashamed to say I'd probably check it out, if I owned a PS3. But there are no system-sellers out there, for me. So, a non-issue.