I don't even bother with Fat Cat when it's crowded unless it's a special occasion like a birthday or New Years, because when it gets crowded it gets CROWDED. On a weekday night when it's manageable, I love the place. A cozy hip atmosphere, some decent music, and a respectable draft beer selection. Every time I stop by there's something different on the list.
I try to stay away from any drinks that have cucumber in them, though. They belong in salads and on burgers, not in drinks.
Fat Cat has tons of potential, but it doesn't scream out at me as a place I want to spend the wee hours of the night. It seems more like the kind of place you'd want to have a few cocktails after eating Chinese food at Argyle or catching a show at the Annoyance. As a stop and drop bar on a weekday, though, it does the trick nicely. On weekends getting through the crowds is like clawing your way through concrete. Don't even try it unless you're into broken fingernails.