Stopped by a couple of times, at first very skeptical of the place. As mentioned above, the first time I only tried the al pastor, and was far from impressed. Then i read this thread and tried some of their other creations, which were very good. On my most recent visit i had a couple drinks and ate a full meal. I was pleased with the queso fundido and the pork belly taco. Both satisfying, not amazing, but very good. Dreaming of an al pastor from tierra caliente I ordered a charred jalapeno. Annoyed that they aren't complimentary (only $1, but then again it's only 1 jalapeno). I resigned to the idea and ordered it, but it never managed to make it's way out of the kitchen.
I don't really need to echo that the tacos are good, yet small and expensive (as has been thoroughly covered above). The tacos are hit or miss, mostly good, and i keep telling myself it's a whiskey bar which serves tacos, not the other way around. For bar food, it's decent and affordable. Are there better tacos, nearby at 1/2 price and 2 to 3 times the size? yes. Better bars, sure, depends what you're in the mood for. There is just not a good bar that serves good tacos (that i know of).
Yet, something else leaves an unsettling feeling. The size, price and copycat nature of the food comes off as exploitative to me. I didn't try it, but I'm pretty sure the huitlacoche taco is fine. It's probably not as good as the huitlacoche quesidila you can get at rubi's booth at maxwell street market, which is I'm sure 4x the size (i have a hard time finishing 1 and a half of those things). Brings to mind a though that has passed through my head many times, while eating great, cheap food, something along the lines of: "Wow, I'd pay 4x the price for this taco and still love it..." well now that I've been given the opportunity, I doubt that thought will cross my mind again. With so many other places being more reliable, for tacos I won't be going out of my way for Big Star.
Part of the secret of a success in life is to eat what you like and let the food fight it out inside.
-Mark Twain