Yes, VIA have improved. On the other hand, all those FUD stories people used to spread were just that: FUD. I've been using VIA chipsets since the days of the 486DX/2, and they have always been in the ballpark. The IDE drivers, for example, were a Sound Blaster fruit-up.
Take the 300 to 500 MHz period as an example. People used to spread all sorts of stupid stories about the MVP3, most of them pure hokum. The wonderful old Intel BX was better, but the MVP3 was in the ballpark just the same — it was to the BX as the Nforce II is to the KT-600 is today: not quite as good but OK if you have a good reason to favour it.
My beef with the Nforce II is that, yes, it's OK (though clearly inferior to the KT-600) but where with the MVP3 there were the countervailing advantages of lower price, better range of form factors, and support for our favoured CPUs (K6-II and K6-III), with the Nforce II there is nothing to make up for the downside. It isn't any faster (at least, if any, so little that no-one can see the difference), and it costs more.
Installation of the NForce drivers, as Doug says, is easy as you like. The driver problems I mentioned are not installation related in the main. They are to do with the sort of in-depth fine-tuning that a truly mature product (like the KT-600, or the BX for that matter) gets.
Come to think of it, we used to sell a lot of Nforce I boards, from (of all people) ASUS. They were OK. So it's entirely possible that my complaints are really about the hardware rather than the drivers — but I'll bet good money it is drivers. Otherwise we would be able to fix things by swapping hardware around, and we can't.
One last thing: I'm not saying that Nforce IIs are actually bad, just that they have moderate problems, and no particular advantage to compensate. Why bother with second-best?