I visited a couple times about 25 years ago, when my future wife was infatuated with one of the bartenders. TeePee seemed reasonably satisfying back then and I cant decide if tastes have changed that much or the food has objectively fallen off a cliff.
It may be a little of both.
Table service was friendly but inattentive, if that makes sense. Decor is Flintstones meets Happy Days on the Oregon Trail. Or something. Which would be fun....if the food was edible. Prices run a buck or two higher than many Mexican chains; again, reasonable only if the food was better. Or even as good, as BajaFresh, Taco Bell or Chipotle.
In this industry, there's a thin line between venerable charm and past- its-prime trap, and if you insist on lousy ingredients and dont bother to ask customers how they want their heuvos cooked, then even if your front hostess is a doll, you're on the wrong side of that line.