Though, to be fair, more than a few people have been really uncharitable to them and have turned minor issues (like faction aesthetics) in to huge mountains. It's especially jarring when there are some people who have played Warzone for a long time that are getting drowned out in the screaming over how things look wrong. I think it is possible to phrase criticism without having to resort to hyperbole.
I personally actually liked the Everasseur as presented, I liked the initial Bauhaus concepts and easily saw the 1st Edition influences in the helmet design that the artist went for. I know this is something a lot of us have been wishing for over the last, well, close to a decade. But I think some people are taking it a bit personally when a concept or piece of art doesn't match their expectations.
Prodos seem to be a decent bunch and have been fairly responsive to criticism and concern, but a lot of people (not saying anyone here) have a gone a bit beyond reasonable criticism. Remember that the guys at Prodos are fans of the game as well. They played 1st Edition, 2nd Edition and even Ultimate Warzone and had fun with it. This is equal parts business venture and labour of love from fans of the property. It can't be easy to show off a concept and have a bunch of people crawl out of the woodwork to imply that they are just doing this as a cash grab and that they are destroying the soul of the game.
And as they said, they are running the concepts past Malmberg, the guy who created the universe we have loved for the last twenty years. If his blessing isn't good enough then I wonder what is. I know we all have our own conception of "how things should be", but how that looks can really vacillate from person to person. Cybertronic has had one of the least consistent looks over the life of the game and have appeared as everything from sleek, chromed cyborgs to dirty and industrial looking depending on the artist. Paul Bonner wasn't the only guy who drew Cybertronic and while a lot of people jump to him as the iconic Mutant Chronicles artist, I don't think we should devalue the work of all the other artists who constructed our conception of the game universe either.
Edit - And I say this as someone who actually liked the earlier Bauhaus concepts... that Vulkan is freaking amazing!