It is something special, and a notable improvement from their first album (which I also regard as being of very good quality). I don't mean to imply that Boundless brings something new to thrash here, but the album really is a remarkably coherent expression of everything that makes blackened thrash so great.
Actually it didn't even strike me until you mentioned this but I can see why the production might not appeal to many people. It just doesn't seem out of place with Assaulter's music to me. Other than that I have no idea what you guys don't find amazing about it. I find the song writing absolutely awesome in a 'this is exactly what thrash metal should sound like' sort of way. I suppose it's possible that my soft spot for the band is just too soft. In any case, let's keep the thrash party going around here: (Thanks for the rec Matt. After I hear it a couple more times I will respond to your review.)