Safari is definitely better and faster than IE and Firefox and there's nothing wrong with iTunes. So why?
Probably because Apple's software for Windows is garbage.
I like iTunes on OS X, but when I must use it on Windows, for some reason I really hate it. I never even once tried Safari on Windows; I didn't think I should waste my time with it.
I doubt Apple puts a lot of effort into their Windows applications and that is why many people don't like them.