Canned benches > not. We may not play benches but if it shows the graphics in the game well, its good. Some canned benches are very good showing worst case scenario and stressing cards well. A benchmark that involves variation is not as accurate.
As for boost clocks, he means what a real gamer might get would be different, I think. Eg. if nvidia sends out cards for reviews and those just happen to boost higher than an average card would.
If you don't understand the issue with canned benchmarks, you aren't knowledgable enough to be having a meaningful discussion about these methods in the first place.
As far as boost, there is nothing magical about it. If reviewers were getting cards that magically boost higher, then these cards would have to also use more power, be louder, and/or run hotter. See, that is how boost works. There is a temp target, power target, and fan profile. Boost clocks are a result of these measures. Turn up these targets n a maxwell card, in any system, you will have higher boost clocks.
You can't have one without the other. If reviewers are getting cards that boost higher, they have a higher targets. And since 1200mhz is not an issue on any of these cards, it makes no sense to make review cards more power hungry or hotter when they are being measured and recorded.
See, you don't understand boost either. Those boost clocks are not wild or out of the realm of expectations. No, not every single person who buys one will see those out of the box boost clocks but its not for the reasons you are thinking. The limiting factor is temps which is related to airflow. Cases with limited airflow may only boost to 1100 out of the box. Change either the fan, the temp/power target and boom....your boosting just as high. They could also improve the case airflow and the boost clocks will improve themselves.
All over the Internet, people buying maxwell cards, they all find clocks similar to what reviewers find. This is not some trickery. The advertised boost is not what you are thinking. See, not all work loads are created equal. And games are typically not the most demanding loads for a GPU. Boost is about a target power and instead of a fixed clock speed. See, one demanding app may use 180watts running at 1070mhz. That task may be very demanding but then another task which is much lighter and only uses 150watts at the same clock speed of 1070mhz. So, just like intel, nvidia decides to try to take advantage in loads that aren't as demanding. Boost will push up the MHz when the load allows it. This is just using untapped TDP. And since gaming loads are typically not as demanding, it works out really well.
You seem to think that the advertised boost clock is what the worst cards should reach when actually it is what you would boost in the most brutal and demanding gaming loads. Boost clocks are game sensitive. Some games allow higher boost than others. This can't be helped. Boost is designed around that fact. Some loads leave TDP on the table, why let it go to waste?
The boost clocks reviewers get in the games they review aren't out of the norm. Not everyone will have the same results because not every card is in the same environment. But they are usually pretty close and not too far off. There maybe some cards in cases that are really stuffy. But even then, get the temps down or change the temp/power target and you won't have any problem running at 1200mhz boost.
Nvidia was nowhere near aggressive when it comes to boost. Their target of 80degrees and auto fan settings in the driver, there is no reviewer out there running boost speeds far out of the reach of the cards on the market.