My first RUB experience was not particularly good, but given how the reviews on this board have turned around since they first opened, I thought I'd give them another chance. Unfortunately, I didn't get the opportunity to do so.
Three of us arrived last night around 9:00. We were told there would be a short wait for a table, so we headed over to the small bar area and ordered beers. We immediately noticed how hot it was, but we were there and decided to stay. After about 15 minutes, however, we decided that the heat was unbearable and we decided to go elsewhere. Apparently, their AC system is inadequate. They are aware of the problem (it would be impossible not to be) and claim to be working to fix it. So, if you're particularly sensitive to the heat, you might want to stay away from RUB on hot days until they can get this fixed. (In fairness to the restaurant, there was a good crowd there nonetheless, so obviously not everyone was bothered by the heat.)
As others have pointed out, we also noticed the increasing number of items that were sold out during the 15 minutes that we waited at the bar. By the time we left, they were sold out of ham, turkey, deep fried ribs, rib tips, brisket, and sausages (I think there were other items, too; these are the ones I can remember). Surprisingly, they were not sold out of burnt ends, which others have reported often sell out early.
This post is not intended to be a slam of RUB in any way. Rather, I'm just trying to help people set expectations. I would not have been comfortable staying given the heat, particularly given the limited offerings at that point. I'm sure that others were happy to be there.