Let me start by saying I am a long time fan of Dona Tomas, with all its strengths and weaknesses. I ate at Tacubaya for this first time this weekend. I tried the Chillaquiles and Enchiladas. Both were simply ok. Very average. I wanted some salsa to go with the ChiIlaquiles, but was told they don't have salsa... at a taqueria. Really? I didn't have any tacos like I would usually have at a taqueria, mostly because I flinched at ~$4 per taco... are they kidding? Beers are $3.95 each!
I recognize that the quality of ingredients is higher than your average taqueria, but I just don't see the difference in the end result. I don't really see going back.