The first major update that come to mind that has ruined Classic is the idling warp. You can't even sit outside for 10 minutes without being warped to an unwanted area. Another terrible update is the Alignment Point system. The AP system has no necessary use to the Classic society. All I see is disadvantages if you spar, PK, or tower. But if you sit and do nothing your only advantage is the ability to not be hurt by a sword. Yet another useless update is the Guild Picture approval. I see the improvement it made, but it's ruined the idea of Guild Pictures. That's all I can think of at this moment, but the main two were the Idling Warp, and AP system.