On a serious note thought, I had a look at the menu and as a SoCal who has spent plenty of time in the Mex interior as well, the menu looks like the real deal.
Very eager to try it out on next visit to London. Mestizo in Warren Street is probably still the best, though.
I like enchiladas and burritos too, but they are not truly "Mexican Mexican" food, nor are they really "Tex Mex" (fajitas are Tex Mex). Enchiladas and burritos are really more of a "Mexican American" thing, created by Mexican immigrants in the '50s and popularised through the Southwest and then all over the U.S.
If I go to a "so-so" Mexican place in the UK, like the Texas Embassy in London, I'm happy to have enchiladas (it's just sort of like Acapulo back in the US). But I prefer the real Mexican food -- only places in London I've had that are Mestizo, Taqueria (Notting Hill), Green And Red (£££! Shoreditch) and El Panzon (Brixton).
So Wahaca looks promising indeed -- can't wait to try the pollo pibil tacos.