Interesting thread.

I've dined alone a fair number of times … everywhere from grubby, dives/bars to proper Michelin 3 star restaurants. That I can recall, I've never once found myself feeling uncomfortable, out of place, etc.

I'd say I usually receive service at least as good, if not better, than what I receive when dining out with others. At the nicer places, I typically find myself back in the kitchen having a chat with the chefs.

In terms of preference between a table or the bar, I go as the mood strikes me (where there are options).