La Tortilleria is a bit of a hybrid as it is definitely a restaurant but also sells their fresh tortillas, sauce and chips (as well as a small selection of other Mexican ingredients). Because of this I really think that a review of this place has to separately acknowledge each of these functions.
As a taco joint, this place is solid but not the best in Toronto (El Trompo is better). The tacos are flavourful (if not quite 100% authentic), sauces have good kick, and they have some things that the other places don't (like mole).
As a place to get fresh tortillas, salsas and sauces, and chips, this place can't be beat in Toronto (although for a wider selection of Mexican grocery items you need to go to Perola's across the street).
If you get a pack of the tortillas you will find the paper bundle they put them in will be soaked through with condensation by the time you get home which is a testament to how freshly pressed they are. Like all corn tortillas however you are on the clock when you get home, as within 12-24 hours these puppies will start to get all rubbery.
Another great thing to buy from here is the mole starter, which is basically a brown tarry ball of concentrated mole. All you have to do is heat up the starter with some water or stock and you have instant quality mole. This is apparently a very popular item in Mexico and having prepared mole from scratch before (which takes forever) I can see why.
In short, as a place to eat this is worth stopping by if you want to mix-it up once in a while in between El Trompo visits, but is definitely a must do if you're looking to grab some tortillas, chips, sauces etc. to use at home.