A lot of people seem to make it seem like Undertaker was always loved and worshipped whether he was a heel or face, but many often forget that during his Ministry of Darkness era, fans shat on him like crazy. It had nothing to do with him playing a very evil satanic gimmick at all, people just hated his segments and matches during this time, and they thought he was very boring. You could start to tell people were getting sick of him starting at Judgement Day 1998, his match vs Kane, which seemed like it would be a big deal, was the farthest thing from, fans were chanting boring during the whole match and all the energy was sucked from the building the entire time until Austin did his shtick. Also, he would do very long satanic ritual segments during his full Ministry phrase and people would also chant boring and call for Austin during these segments, i'm not sure if was boring or too drawn out for them, but they certainly didn't care for it. One of the funnier moments was when he sacrified Dennis Knight and slit his wrists and force fed him the blood and all the fans started chanting "BULLSHIT! x100", and of course who can't forget his match with Big Boss Man at WM15, which is considered one of the worst matches, if not, the worst match in Wrestlemania history, you know there's a problem when the crowd doesn't react one bit to a man being hung from a cell.