We came here after I yelped "Unique Bar" in our area, but we knew there was a chance it wouldn't be the type of joint we wanted to hang out in.
The Mermaid Lounge is an attractive looking bar inside the Silverton Casino and Lodge with a decent number of people hanging out, but you can do better in Vegas a little too easily.
Honestly, everything other than the fish tank in this place is basically mediocre. As a note, they don't serve food except Thurs-Sunday, and their beers are a little more expensive than the average place in an off-strip bar.
Our bartender was average, though he did nothing in particular wrong. Additionally, three of the TVs over the bar were on blank screens for whatever reason. Finally, no mermaids, but we didn't expect any on a Tuesday night.