Yes ! High Speed DVD-R 騙子是很少 ! ! !
-R is BAD ! 無法16X燒 ( almost a Golden Rule ! )
-R has more difficulties to reach high speed than +R !

+R is superior to -R ( result from the different Addr_Info Carrying Method of them )
-R's Addr_Info is carried by the Land Pre-Pits while +R is carried by Phase Modulation Wobble.
-R has worse noise immunity and more error prone . . .
You can know more by :
http://www.cdfreaks.com/article/113

It is said that You can Burn VIDEO DVD by +R 騙子 !
But I don't know HOW !