First, it has lots of useless features (system restore, which most power users will have to go to the trouble of disabling). And they now have integrated some movie maker crap into the OS, so it's more bloated than ever. Besides that, it seems to crash a good deal. Even on an HP system, which has ME preinstalled, it seems to crash more in the 2 hours each week that I have to use it, than my box, when it used to have Windows 98 installed, would crash in a month. So that's why I don't like it; the only good I can say about it is that it boots quite fast.