Sounds like you've never tried well prepared vegan food. If the meal you had was mostly carbs, that's the fault of whoever made the dish for not properly balancing the macros. And obviously plain, unseasoned, poorly cooked tofu will be flavorless. Boil a chicken breast, eat it with no seasoning, and let me know how it is. Properly prepared, vegan food can be just as tasty as non-vegan food