We really only eat fast food when we're road tripping.  Or, late at night after a concert or something when we're hungry, don't want to scrounge in the fridge, and there's nothing else open.  
I don't really consider Taco Bell to be Mexican, I guess it's sort of Mexican-adjacent.  But it's fine for what it is.  I ate a lot of it in college because it was super cheap.  I could get two tacos and two burritos for $2.36 plus tax.  I guess it's still fairly cheap compared to what has happened to other fast food prices.  When a burger combo at a fast food joint approaches or exceeds $10, I'm definitely going to look elsewhere for a quick meal.