I didn't like all the changed in DH2, but at least it was different, and the wound system was a hell of a lot better than the current 40k RPG one.
I'll never get that "at least it's different" sentiment. "Different", by itself, isn't a quality.
It also means [insert length of time here] of closed playtesting and then beta playtesting on top of that, to refine the system they'd written, was entirely pointless. If I thought that they were going to scrap the main changes (which I liked), I wouldn't have bothered, I'd have just played a proper campaign rather than building stuff intentionally to try to break the system.
On the other hand, it means all those long years of FFG refining the core engine inherited from BI, and all the feedback gathered on the subject through countless development cycles, isn't suddenly pointless.