The message board changes from Y! get worse every time and I think that this time it may have pushed people too far.
1. Y! is jamming more and more advertising into the pages. It takes forever to load, and lots of time to process. If you're on DSL (or heaven forbid anything slower) it is not an enjoyable experience. Likewise if you're on any prior generation Intel CPU. If you're on DSL with a prior generation CPU, it is unbearable.
2. The new messageboard design has problems. I routinely get errors all over the place with Internet Explorer 8. It will prevent me from posting without clearing out the cache, I have trouble even reading posts as I will get other errors. If I use Firefox, it seems to work better though still has some issues. However, most of the world is still on IE and if they experienced the problems I did, it is understandable why they're being driven away.