I went to Taco Guild once, and I don't think I'll ever give it another try...here's why:
There was a live band playing disco music in an old church, that was fun. The server was kind of snotty, inconvenienced by my menu questions and recommendation requests. The margaritas were decent...the tacos and fundido appetizer were just meh, nothing to write home about. My gut hated me within hours, and that hatred lasted well into the next couple of days.