I was a server there back in the fall. I can answer a ton of your questions and concerns, actually.
Most of the time, things were pretty good there, but I will tell you what was happening for each:
Bad service: You likely went in the afternoon. The afternoon waitresses were known meth heads. If it was in the evening, it was probably the girl who was more focused on stealing tips from myself and others (I got her fired when I caught her).
Slow service: We had four fryers at the start of football season. Every month or so, one broke. They never got repaired. By November we had one left, and if you think about how much that place fries food, you will understand why that would ruin things.
Bad food: Either you don't like it, or you likely ate there in the afternoon. The head cook in the afternoon was the ranking employee by experience and thought she would get the manager position when one left. She didn't, and from that point, I kid you not, she sabotaged the restaurant.
Warm beer: Can't help you there. Only thing I can think of is that we flew through our Pabst kegs so fast that they didn't have time to chill.
Any other questions?