This is why I am a fan of Circle Bar at Hard Rock:
People. Watching.
Okay so you can people watch anywhere really, but Hard Rock is one of the best places to do so. I don't know what it is about Hard Rock, but it attracts some really ridiculous people. I'm talking really drugged-out or just plain old stupid drunk Las Vegas tourists. If you don't have anything better to do on a Friday or a Saturday night plopping down at Circle Bar and enjoying the circus parade through to different night clubs, etc. through the Hard Rock is hilarious and fun.
Also, I've been here on more occasions than other casino bars because I frequent The Joint for concerts. So, going to Circle Bar beforehand is always a nice precursor to the evening, or even going there for post-drinks.
Prices are typical Las Vegas casino prices. Don't expect to go here on the cheap or anything.
Also - Circle Bar and Hard Rock itself are better for me being a tattooed girl. At Hard Rock if I wear a sleeveless dress I won't get the weird stares at my large tattoo I have on my right arm. And more often than not I'll get compliments about it over anything else.