So far the main bugs I have are the the standing-while-drinking and other restaurant guests wandering around and not eating their food. However, not all guests were wandering, just this particular blonde couple here.
Just chillin' in the kitchen, no big deal.
Some of the guests standing around while drinking (also, clown hair, ugh).
The blonde couple eventually sat down when their food was served, but only the woman finished hers. The man didn't even touch his. They were super cute, though; they kept flirting with each other. Guess the guy was too busy. ;)
My Sims behaved perfectly fine. I even brought my club over, and after spotting one of my members heading towards the kitchen, I just chose "Sit Together" and everything went along perfectly. I haven't tried running a restaurant yet, but I am very pleased overall with eating at one. :)