Dive bars in AC. Decent beer, darts, pool?

Since you specifically said 'Dive' bar I assume they don't necessarily have to serve primarily craft beer.

My recommendations:

The Irish Pub (on St. James)
The mountain bar (i think thats the name) in the wild west part of Bally's (24hr happy hour.)
There's also the sports bar upstairs in tropicana that has good specials on Sunday

Hope this helps - while I'm making recommendations I will also note that for cheap/ridiculously good food you should try Bill's Gyro on the boardwalk (again near St. James st.)

 

BoneYard is a decent dive bar with about 8 craft on tap and a couple bottles. I was in a few weeks ago and food was also good. It's a block from the Taj.