I'm not good at the ranking thing, so here's a variation on your request:
LeCellier - ate there solo, was fine. My server was attentive but not smothery
Liberty Tree - haven't eaten there (yet). I'd feel weird about the character attention, but that's just me
Plaza - haven't eaten there; I figure it would be similar to eating in a local restaurant, though, and don't think it would be strange or uncomfortable
SciFi - ate there with others, but would feel fine going solo - the movie clips give you something to focus on, and since everyone is facing that way, no one is facing you
Brown Derby - haven't eaten there, but would be no problem - food and service should be good. I can't imagine any discomfort there
Kona - Again, have not eaten there, but would like to sometime. I'd feel perfectly OK there
HTH!