He genuinely did some quality stuff in the 1980s and 1990s. Populous (1989) and Powermonger (1990) were genre-defining, and in their era, were amongst the best games available on the Atari ST/Amiga.

He seemed to have a run of innovative classics - Theme Park and Dungeon Keeper were quality…

…and then at some point he just started promising things he couldn’t deliver. Black and White still turned out pretty good, despite the broken promises…

… then in the last handful of years, he’s worked hard to destroy his previous reputation by churning out overhyped shit.