XP sp1 and 2 were more or less the same as me with an updated UI and non existent 64 bit. However flawed vista was, it added an actual tangible benefit for 7 to further improve on.

I'd argue 7 was the last windows os that could be described as "better" in some way than what came before (which most, even the ones we remember as "bad" at the time, did offer some real step forward which isn't true for 8/10/11).