Brownie's is like an oasis in the Old City desert of swank bars/clubs. There's no need to try and impress anyone here as the place itself is unassuming and has a very comfortable vibe. The beer selection is top notch and changes regularly. The bartenders are also really cool people and do a great job with the music they play on their i-pods (over the last few months we've heard everything from Jimmy Cliff to Horton Heat to Johnny Cash to Zeppelin). My wife works in Old City and this is our favorite spot to stop in for a couple of beers before heading home, and Saturday afternoons and early evenings are great for college football too. For those who don't need all the flash and attitude Brownie's rocks.
Pros: great beer selection, bartenders, vibe
Cons: none come to mind