Honestly, I love The Plaza. You can catch me here almost every Thursday night for the $2.50 Long Island ice teas playing a game of pool in the back room. There's definitely a hipster crowd that likes to congregate here on Thursdays; it's a more relaxed alternative to the state street bars.
The bartenders are all gems.
Thursday nights pull a crowd and you may end up waiting outside for 20 minutes if you come around 10:30pm. Any other night is basically dead. I hear the plaza burger is really good, but I have yet to try it because they close the kitchen before I usually get there.