I do plan to try Taco Bell at some point, just haven't got round to it. If I eat fast food twice a year that would be a lot (assuming we're not including Tim Horton's for breakfast and the obligatory roadtrip Timbits).
We don't have Sonic, Hardees, Carls Jr or Moe's in Canada, at least not that I'm aware of. Of my "not tried" list, the only ones available in Canada are Taco Bell, Five Guys and Nando's. Chipotle might be here but I haven't seen one.
It certainly makes it harder to check them out if they're not in your country. I like 5 Guys fries, but the burgers are just okay.
I've had Mexican food in southern California, Arizona, and Texas. I'd never call Taco Bell "Mexican" but Taco Bell late at night when you're not sober is great.
The reality is, it's all garbage and certainly takes precious moments off my life every time I consume it, but fast food and Starbucks are pretty much the only things that filled the gap for me once I quit smoking. I'm definitely a "shitty food and coffee" addict, but it's still better than cancer sticks.