The service is AWFUL. You'll never know if you're going to get what you ordered, and if you don't they're likely to blame you for it. However, after a while this passes for entertainment, it's like dining at Fawlty Towers, and since the food is awesome, it really doesn't matter.
Beef in Chili Sauce is my recommendation. (Unless they're out of beef, in which case pork will do fine.)
A definite must go to every time I pass through Tampere.