I had two completely different experiences at BlackFinn.
Experience #1: Upstairs about an hour prior to close. It was DEAD. The one server working was robotic and clearly not the sharpest tool in the shed. I was impressed that she could breathe, however, since she had her bewbs pushed up to her throat. Seriously kid, this isn't Hooters.
The drinks were overpriced, but the food was decent. The frat-boy types at the bar, hooting and hollering at the Braves game, made me wish for industrial strength rubber bands (either to shoot at them, or to shoot at myself. Either way, I'd have been distracted).
Experience #2: Downstairs after the upstairs had closed. The prices were still too damn high (more expensive than my local bar in midtown Manhattan!), but the server down here was a complete doll! If I would have known the bottom part was so awesome, I would have come here right from the start.
Overall - 3 stars.