[Death by Mirrors]

From my personal experience, custom content in Sims 2 wouldn't mess up your game as much - whenever I ran into problems with my mods, I could simply remove the file and continue playing without any issues. In Sims 3 however this often led to corrupted savegames, so I only have a little bit of custom content there (mostly hairstyles and clothes). Which is a shame actually, because I remember some of the best stuff always came from dedicated fans.