Buffalo Wild Wings review: cleanliness

I was grossed out as I watched a server clean the table across from me with dirty napkins she had picked up off the table to clear it. I did call the manager to let him know what I saw, and asked him his procedure on training his employees. He said its a two step process and maybe I just didn't see her clean the table. NOT. I watched the entire event.

Also the hamburger which took 30 minutes for me to get was tasteless. No seasoning. I will say it was cooked perfectly, just not very tasty.
I will not eat there again.