What kind of enthusiast has crossfire but doesn't update drivers? :/
Smart ones, people who upgrade their driver every four seconds, simply incapable of understanding a hotfix for one game is just as liable to break another, and those going after every hotfix which is a beta, nothing more or less, have infinitely more trouble than those who stick with older drivers and all of 3% less performance.
I still don't jump on every single new driver just for the sake of it even though I've not had xfire for a while.
95%+ of AMD and Nvidia "driver" problems are user error, and 99% of those people who post about their problems refuse to accept decent advice and just install driver after driver after driver.

No they're not. I can't remember the last time I had any major issues with Nvidia drivers, In fact I can't remember the last time I had any issues with Nvidia drivers full stop!
A list of my more recent Nvidia cards I've owned including SLi configurations without any significant issues:
7600 GT SLi,
8800 GTS 640MB,
8800 GT,
8800 Ultra,
GTX 280,
GTX 260 SLi,
GTX 480.
What you've said makes no sense and has no relevance, go on NVIDIA'S own forums, the TDR thing has been peeing off MANY people for a pretty long time, there are plenty of issues with Nvidia drivers, they just do a better job of keeping them quite. The AMD forums are horrible, not easily accessible, and badly supported. nvidia's are good so people with problems go straight to Nvidia so you see less moaning on here.
it's really that simple, AMD and Nvidia have driver issues, AMD are NOT worse than nvidia and lately Nvidia have been the more problematic. The "major" AMD effected issues like [H] banging on about xfire/new drivers/new game support, are down to user error normally. He made a huge deal about Startrek Online and dx11 not working properly...... when in fact both dx9 mode is faster, dx11 offers little to no IQ improvement, and other people have DX mode working fine with an increase in performance that AFAIK keeps it well ahead of Nvidia as they are ahead in dx9 as well.
The vast majority of "big game release problems", are problems that effected Nvidia AND AMD, some of them AMD sorted out faster, and they were problems with the game, not in particular either companies drivers.
Skyrim is cpu limited mostly, Rage was just a horrific pile of crap and I can't even think what the other one was, loads of complaining about AMD's terrible drivers, when Nvidia had every one of the same problems, its utterly mental the blind "Nvidia drivers just work" stance on here, old reputations don't die, ever.