Vegetarians are vegetarian for lots of different reasons. Some of them dislike the taste and texture of meat. Others do it for health reasons; still others, for moral and ethical reasons.
The ones who dislike the taste and texture of meat probably won’t like many of the meat substitutes. (Well, except that some of the meat substitutes are not much at all like meat, and you have to look at the picture on the label to see what they were trying at.)
I’m not a vegetarian, but I like a lot of the vegetarian foods that attempt to fill a similar role as meat but don’t try to imitate it slavishly. There are veggie burgers that can be cooked on a grill—a perfect replacement for hamburgers—that nobody on earth would mistake for anything but a veggie burger. But they’re tasty.
@casheroo: There are veggie burgers that are an attempt to mimic hamburgers as closely as possible. They’re pretty vile, but not as vile as the soy protein bratwurst-substitutes that I tried at one cookout….