I still use Vista.
I think there issues at the beginning - lack of 3rd party driver support.
People were plugging in 5 yr old printers and the like , then getting mad when they didn't work. Probably because the printer manufacturer couldn't be bothered to provide drivers - and why should they?
Would have been better if MS had provided slider controls for the rather over enthusiastic uac - and for shadowstorage.
In other respects , a very fine o/s.
64 bit Vista runs beautifully on my 5yr old machine with 2gb ram.