As far as Jack n Grill, I've only been to the original at 25th and Federal. I've never had the 7lb burrito either. I typically get something with their shredded beef, and bland is probably the last word I would use to describe it. If the chile isn't spicy enough, just ask them to make it hotter.
I moved down to Houston last year, and I hate the Mexican food here. Bland is being generous, as much as I've seen so far.