I have only been to the Armadillo Palace when the bands are playing, so I can't speak for lunch or dinner, but the service is pretty spotty at night. Sometimes you can get your drinks quickly - sometimes not. I once sat at the bar with a $20 in my hand for about 15 minutes waiting for someone to ask me what I wanted. And I've had other people's drinks added to my tab when I sat at a table.
The music is usually REALLY loud and it's impossible to see the band unless you get there early and get a table right in front of the stage area. There is no dancefloor, but they do move some upfront tables to make room. They do have good bands though.
On a positive...the food is really pretty good. I've had trhe venison chili several times and highly recommend it.
Pros: food is pretty good
Cons: service is usually slow and indifferent