I enjoyed Lobby Bar for what I went there for....which was to have a drink with my bestie, wait for Surrender to open, reminisce about times past and get philosophical about life.
It's located in a prime people-watching spot on the casino floor near the guest elevators. The look of the lounge area matches the rest of the Encore décor...classy, red fabulousness.
We only ordered drinks, which were pricier than your average bar, but not any more expensive than anywhere else inside Encore. They also had nuts and chips (the designer version... ;) ) which I snacked on while sipping my $9 Sapporo.
The service was friendly without being overbearing. Our waitress checked in on us a few times, but I think she could tell we were definitely a low maintenance table. We just wanted to be left alone to our girl talk and she obliged :)