I don't mind DLC for the most part. Paying for extra costumes, bonus missions/sections (outside of main story), etc. are all good but having DLC for a continued ending bugs me. Like you mention, I do like the default ending but than again, I didn't pay $60 for the experience. Different strokes for different folks I guess but I wouldn't want this to be some sort of precedent for AAA gaming going forward. For that reason, I think it's a good thing that fans were so outspoken with the DLC release. Better that than Capcom doing this with all of their releases.
As I state in my review though, I do like the game overall and would recommend.