Okay, I'll start with the obvious...
Their TV ads suck and have sucked for years. In fact they could probably stake a claim for the most consistently sucky local television advertising. (Though Taco del Mar's latest TV commercials are gaining on them.) Adding the stupid talking cactus was definitely the turd in the Taco Time swimming pool.
Now on to their food. (Please put the floating turd out of your mind.)
Most fast food joints have made concessions to the fact that some of us like to try to eat healthfully. Usually, this amounts to a pile of lettuce with a deep fried chunk of chicken breast accompanied by a packet of high salt, high fat dressing. So much for health.
But you can go to a Taco Time and find a number of low fat options, from salads (which they experiment with a lot...usually coming up with tasty options) to lighter versions of their burritos.
Sneak in an order of Mexi-fries (a mildly spicy twist on the tater-tot) once a month or so and you can visit a TT fairly regularly and walk out satisfied that you ate something that won't clog your arteries before you reach your car.
Here's another amazing Taco Time tale. They give you free ice water...and even ask if you want a slice of lemon in it. No charge for the water. No charge for the cup. No charge for the lemon. Wow.