Super, super fun bar.
I guess some call this place a dive because the interior is a dark and pretty sparse. But it's really not a dive and that is not a criticism in any way. The cocktails (and beer selection) are very upscale and super crafty and the bartending crew is outstanding and over the top friendly. Trust me, there are no surly barkeeps here with lit cigarettes dangling out of the corners of their mouths.
We tried a few of the different cocktail creations and they were outstanding. It seems that the cocktail menu changes frequently so ask the bartender about the different drinks and you will get some insider info on what to try. if it's available, the Smoked Melon cocktail (with mezcal) is fantastic and positively addictive.
Some Yelpers don't particularly like the area around Atomic because it's a little rough around the edges. Well, yes, it is, but it's no rougher than anywhere else near Fremont. Like anywhere in the world, be aware of your surroundings.
Atomic for the win.