Scripts are ok except, like Raven says, they do something to annoy me like open popup windows or try and install stuff on my pc (things like Gator and the like). Unfortunately most people here host their sites on geocities or other free site that have to have popups to show ads to pay for the hosting.
Sites that have script errors also annoy me as I get numerous popup error messages (I need error notification turned on as I develop websites myself). Also get lots of 'permission denied' popup errors that annoy me.
Most scripts, like rollover menus and popup menus are ok and the odd site that like to have text or graphics following your mouse cursor are just about acceptable.
Even this forum site has LOADS of scripts on it but they all work properly, don't produce errors and are mostly invisible to the user.
Boo!