wow! i hadn't seen this tread! Been very busy with work & stuff so haven't been in the interwebs much.
As a Mexican born & raised, my favorite place used to be "Taco Loco" in the southside, which after closing became the taco-stand outside of Reynas. "Don Luis" keeps saying that he's going to reopen another full restaurant soon in the Strip, so I'm waiting anxiously for it.
"Madonna's" Burritos are definitely AWESOME -real TINGA!! And while the owners are Middle Eastern, the cook is an actual Mexican woman, so I approve. However, I only recommend the Burrito-tinga. Everything else on their menu is awful-awful.
"Mexico City" In downtown became my go-to of Mexican Food, however with their new "watered-down" menu they fell off my list. They are still very authentic, but their offerings are now mostly geared to general public (gringos). They had some old dishes there that I really loved, in special their "STEAK RANCHERO".... However, since I know the owners, when I've gone back there I order off-the menu that dish and can get it no-problem.
"Las Palmas" in Beechview has very authentic tacos! I've had them and they are what you would expect from a regular family kitchen for tacos, etc.
"Cuzamil" in Squirrel Hill ranks good overall in my list. All their dishes are very authentic.
"Los Cabos" is definitely tasty! I've mostly had their tacos and they've never disappointed.
"Verde" sucks as a Mexican Restaurant, but excels at their tequila selection. Is such a shame because they have good dishes, but they don't prepare them well, which I think is because they try to make it too "fancy", making their food in the end un-edible. The only think I like from their menu is their "Queso Fundido con Rajas"... that is the only dish that IMHO stays true.
From "Round Corner Cantina", their food is definitely very Border Tex-Mex and rather good at it, but what I really like that is more "Mexican" and less "Tex-Mex" is their "Esquite", which is something I used to eat as a kid.
Mmm... other than that, my kitchen cooking is more Mexican than most in Pittsburgh -HA!
ps: FYI, Mexican Food flavor changes abit between Northern Mexico, Central Mexico, and South Mexico. I identify with Central Mexico/My Mom's cooking