Ordering Mexican

I never know WHAT I'm ordering when I go for Mexican. Burrito, tortilla, enchilada, tostado/tostada, taco, fajita, pico de galla... isn't it all the same? All I know is I'm getting some kind of flour-thing wrapped around savory meat, and topped with cheese and various veg-eh-tabales.

When I sit down to have a look at the menu, it all looks good, so I pick a number, any number--and get about the same thing regardless. What's the point of a menu when I can just say: "chicken" or "beef?"