I don't know where you live, but if you're in Florida, and you shop at Publix, I would definitely avoid the Publix "Green Wise" brand Vegan hamburgers. I just tried them last week, and they taste awful. Morningstar's "grillers original" are a much better soy-based hamburger, although it has egg white, so it's not vegan.
For those who don't know, Publix is Florida's biggest supermarket chain, and "Green Wise" is their supposedly eco-friendly house brand. Since becoming vegetarian, I've actually been pretty impressed with Publix. Their own brand foods tend to be inferior, but most are at least edible, which is more than I can say for those vegan burgers.
But they have a pretty good selection of other brands of veg*n stuff, like Morningstar, Silk, Boca, Yves, various tofu types, etc. All in all, I've been pleasantly surprised. They even had one of their demo display tables a couple of weekends ago trying to get people to try soy milk, which shocked the heck out of me. And their house brand vanilla soy milk is actually pretty good. Their plain isn't as good as Silk, though, and Silk is cheaper, surprisingly.
As for other veg*n products, I like Morningstar's veggie patties and Boca's fake chicken patties. I haven't tried many others yet. Again, the Morningstar stuff has egg white, so it isn't vegan. As a new vegetarian, it's close enough for me, for now anyway.
--Fromper