My biggest issue with lettuce is the size of their portions. Even if all you eat for a meal is a salad - these things are HUGE and there's no way they can be the recommended portion size. I don't really mind that they're so big, but they should offer a smaller size for people who don't want to eat 1000 pounds of lettuce for lunch.
I must say though, Lettuce is efficient. You can write your order down on a piece of paper and give it to the salad artists and they will whip it up nice and fast. They have tons of fresh toppings like veggies, dried fruit, meats and cheeses. Every time I've been there, the salads have been good, but it just bothers me that I have to spend like $9 on a salad that I can't even finish. That being said, they are pretty tasty!