Honestly, if you surprised me with a computer running Windows XP I think the most immediate feeling I would feel for that computer is love. Windows 95/98 would also bring up some feelings but not as much as XP.

But yeah, "business as usual" Windows without nostalgia attached is hard to love, in my opinion. For the most part it just works decently but has a "It doesn't seem like I'm in control of my computer, really" feel to it.