1) They're not bad overclockers. Most can get at least +200MHz off the base clock of 1006MHz, which in prior generations would have been considered pretty damn good. Some people just like to make asinine assumptions based on how big the (totally irrelevant) "offset" number is, or that OCs should always be judged on a "percentage" basis regardless of the fact that it has such a high stock clock. However I didn't see those same people declaring my 607MHz->875MHz GTX470 a world killer when it got nearly +50% on air.
2) They throttle a whopping 13MHz at 70'C, and another 13MHz at 80'C. It increases stability, and grants you higher clocks/better performance than would normally be attainable. Instead of crashing at a borderline-stable OC when your temperature raises, you'll now continue unphased at stable settings.
3) Boost isn't going anywhere, nor should it. The results speak for themselves.