I recently had the housemade veggie burger at The Druid and it was the best veggie burger I've ever had. I didn't think I liked zucchini, and there was a lot of zucchini in it, but the whole thing was delicious, lots of flavor, good texture. It also stayed together well. All in all the perfect sandwich. I eat meat, and The Druid's fish and chips are great, but I'd order this everytime I go back.
In contrast, I also recently had the vegan burger at Deep Ellum and it was truly awful. "Grilled seitan" had no flavor and strange texture. But it was the no flavor that really killed me. Never ordering that again.
I would love to hear about other great, preferably housemade, veggie burgers. I'd like to try some more.