Since I do not go to the bars to look for dates, I guess my opinions on this aren't really the opinions that you would be looking for...
My only thoughts are.. If you approach a lady in the bar, I would compare that communication with emailing or calling a lady in advance. You're communicating to see if you would be a good match.
You would ask a lady in email or via phone for her reviews, so why would asking a lady at the bar for her reviews be any different?
In a city, especially one like Vegas, if a lady does not have reviews and you have randomly met her.. Be it's. P4P or a civvie pickup.. Just be sue that
1) only you order your drinks and they never leave your sight.
2) everything in your room of value is locked up. All electronics and cash and etc.
Anyone care to add to the list?
Dear OP, I know you aren't claiming to take non verified ladies upstairs.. This is just to the gents who are considering it.
Fwiw, I would always have my cash in a safe. I just leave out my iPhone to play music.. The main concern with a random lady is that she will drug your drink or get you when you're least expecting (shower, asleep, or drugged out).