It works. I have no complaints at all. If I ever want to block those ads, I can just check a checkbox.
If AdBlock Plus also offered a choice when installed (I don't know if it does now), it would not be an issue at all. If they instead hide the option away, a lot of nontechnical--and probably some technical--people will be confused about why the behavior changed.
I think that the ultimate quality of the change depends on exactly how they handle the UX behind.
As for the intent and general idea, I support it entirely. As others have said, I do not hate all ads, just annoying, distracting, loud, obnoxious and sometimes vulgar ads which some websites employ.