I have always loved Porsches and air cooled VWs. I owned a ratty 912 back in high school, would like to own a real 911 someday, would like an n/a 911 from 78 to 98. We are moving out of Alaska later this year and I am seriously considering buying one when we get to warmer climates: 911 prices are seriously low right now.
Driving a rear wheel drive, turbo Porsche has always been a handful, from the time they were made in the late 70s until today. NA 911s are tamer. It really takes an excellent driver to drive a turbo 911 at 10/10ths, and that is beyond my driving skills. I read once that almost 50% of 911 Porsche made from 1976-1980 have been crashed once or twice. When the 911 Turbo came out even professional drivers said it was a scary car.
Poor engineering? I don't think so, I say it's more of a challenge. There are a few who can do it well, an yes, that does include the RUF driver on the video I posted.
Here are other videos of 911 (and 911 derived) turbos being driven at their limits by guys who know how to do it:
Porsche 935 (a monster in its own right) at the Nordschleife (pardon the music)
http://www.youtube.com/watch?v=Yj4-clpN8N4
911 GT2 on the Nordschleif too, 7:15
http://www.youtube.com/watch?v=yAxmOvwRZlI&feature=related
Walter Röhrl on a 911 GT3, wet Nordschleife, taking it easy but still a lot of steering work (stock car)
http://www.youtube.com/watch?v=E93ag4Rp-Gg&feature=related
Walter on a Carrera 3.0 RS racing car, dry Ring. I love this engine sound (non Turbo 911)
http://www.youtube.com/watch?v=tzx3zxW-5So&feature=related
for comparison here's the Viper ACR record run at the Ring with Tom Coronel, at times he too struggles with the wheel dancing all over the place
http://www.youtube.com/watch?v=o2mFEC2H0cY
Equally impressive Tommi Mäkinen on the '11 WRX STi
http://www.youtube.com/watch?v=2To_5XjIaMk&feature=relmfu