Joshua's was the first place where I've tried falafel. This was before going vegan, when I had no idea of what falafel was, and I became a regular. Eventually, though, I travelled, tried good falafel, and realized that the falafel that Joshua's serves is terrible. It's edible, if you steer away from the dreadful tahina sauce (you can ask the "exotic", that comes with aubergines and tomatoes) but not better than that. The other vegan dishes, including kibbeh and hummus, are horrible.
If you ask for a pitta falafel, beware that it comes with a garlic sauce to put on the fries that is non-vegan.
And, seriously, if you've ever tried Mideastern food at a half-decent restaurant, don't go to a Joshua's, you'll regret it. In case of despair, when you're in a mall, you'll be better of eating a bean burger on Burger King. You can also get vegan sandwiches and pastas in malls so there's really no reason to eat at this fake Mideastern craphole.