Walked into Hennessey's a couple weeks ago while playing tourist with the wife. We really enjoyed ourselves. We came in on a Monday night and enjoyed their beer and shot special for $5!
Came back the next Tuesday, (sadly no great shot specials) and was treated to a decent local cover band. But their variety of fry baskets made up for it. Also signed up for the 100 shot Jameson Challenge!
So overall, I feel this is a great little spot to hang out with friends and enjoy some cold beer and Jameson shots. It really feels like a real local bar trapped in a tourist trap. (Fremont St Experience)