I lived on Taco Bell in college (and beyond), because it was so cheap it didn't matter if it was nasty. So when the KFC around the corner from me closed down for a while then reopened (just yesterday) as a KFC/Taco Bell I was cautiously optimistic.
I've actually been afraid that having a TB so close to my house (the closest 'restaurant' by almost half a block) would entice me to go there all the time. Luckily, I have changed since college. The fact that two people can have dinner for less than $10 no longer outweighs the stomach-full-of-clay feeling that comes with it. I remember now that TB also stands for Tuberculosis.
Although, if you're in to it, the new KFC/TB is clean and fast. It's still an eyesore, but at least it's because of the paint choices and not the filth.