It's definitely very different than it once was.
In some ways WWE seems to be becoming more like All Japan *just in the sense* that they'd cheer a guy like Kawada or Fuchi even though they were the villains Misawa or Kobashi or Kikuchi would play off of. Classic good vs. evil was basically an afterthought to 95% of their fans.
A lot of people just want to "be entertained" by whatever their perception of good wrestling is and I don't think they really care how you get them there.
That's not to say classic Good vs. Evil will ever be totally absent from WWE's thinking, merely that I do agree it's less important now than ever before. I mean, Brock vs. Triple H, this is basically heel vs. heel is it not? The fans don't really seem to care. They just want to see Brock squash people because Brock is cool.
The only bad reaction from a wrestling crowd is indifference. If you produce anything else, be it cheers or boos, a promoter can use you.