I guess that depends where you get it from. I’ve had bland taco rice too, but find the right hole-in-the-wall stand (literally, like the places where it’s just a window in the side of the building and you walk up and order without going inside), and it can be really good.

Ultimately it’s just rice, lettuce, taco meat, sauce, and cheese. So if those ingredients are quality, it’s gonna be quality; and if not, not. The biggest difference often boils down to the sauce, but of course some lettuce/cheese/etc. is better than others…