I gave up beef starting 1/1/16. Prior to that I was a diehard regular of Asadero getting a carne asada burrito for dinner 2-3 times a week. It's so obviously better than all other carne asada options I've tried (anywhere, ever). The GNR recognition is warranted on that alone.
Their salsa verde is also key, in that it packs enough heat to meaningfully compliment the juicy beef. The burrito style of meat w/ lettuce, tomato, onion and cilantro (ie. no beans, cheese, or sour cream) makes for a much cleaner taste. If you really have a flavorful protein, why would you water it down with all that filler?
If carne asada is your taqueria meat of choice, this is unequivocally your best option.