I've never had an actual meat burger so I can't really say how this compares, but you can have pretty tasty meat-free burgers with plant based ingredients. For instance, a potato based patty, corn fritters, mushrooms all make for tasty meat-patty replacements. What I personally dislike though is those fake meat burgers, like the "Impossible Beef" one. A burger joint here recently got rid of their portobello mushroom burger and replaced it with an Impossible Beef one, so I gave it a try - and it was disgusting. The portobello mushroom one used to be absolutely delish, and I couldn't believe they replaced something so tasty, with fake beef. In saying that, my meat eating buddy tried the patty and he said it tasted just fine, almost identical to real beef. So it was my vego taste buds that rejected it, and there was nothing wrong with the fake beef apparently...

Anyways, I digress, I guess what I'm trying to say is, you can definitely have a tasty burger with plant based ingredients.