Heh, all the recent Vista builds have had built-in drivers for my laptop's Broadcom 440x NIC and Intel 2200BG wireless adapter, so I'm connected right after install. I did a fresh install of XP SP2 on the same machine a few months ago, and it didn't include drivers for either of them. XP's a great, solid OS, but it's definitely showing its age with respect to built-in drivers.
You are right in saying that XP is showing it's age in relation to built-in drivers, but I would also like to state it's unfair to compare the two in regards to that.
If you look at 2000 towards the tail-end of it's "latest OS" stage - although it's PNP support wasn't as good as XP, it hardly had a fraction of built-in drivers for hardware compared to what XP had when it debuted even.
So, you are right, but that might not be a fair fight, don't you think?