When I worked for Sony Pictures Tito's Tacos was a twice weekly stop when we went off the lot. That being said, it's definitely the Cal-Mex school----what they do they do well, but it is definitely Americanized. I can see why they wouldn't do so well in Orange County-----there are great taquerias on practically every corner. Even chains like the Albertos/Albertacos/Alertos do a much more authentic taco, much more East LA than West LA.
It's hard to think of tito's when I have places that make tacos like this within a few blocks of me.
That being said, there is one place I enjoy hard shell tacos on occasion----Jack in the Box!
Odd thing is the Tito's/Tom's in Orange County doesn't get the draw that the Culver City location gets.
I think they added hamburgers and French fries but I'm not certain of that.
Tom's is on my favorite intersection... They're on the corner of Beach and Ball.