Wow, that's not our experience at all. While I cannot talk about a restaurant that you haven't named, I can say that I've found vegetarian meals
even at regular restaurants that are healthier than the other options at this restaurants, and that the vast majority of vegetarian recipes my wife and I have in our recipe database are healthier than the average meal we made before we became vegetarians.
Let's test something. Here's a random recipe that I've posted to our
Vegetarians - Virtual Meal Plan Swap Meet thread:
Mayan Black Bean Soup
Is that something that you would not "consider healthy"? If indeed you don't consider that healthy, I would be curious to know what recipe you would consider healthy. I couldn't imagine any meat-eating recipe to qualify, since they generally already start off by being higher in saturated fat.