You just don't get it.
They are doing different tests. Its not the same test.
I am not expecting to get 12hrs of screen on time since I don't use my device that way.
But I have got the same amount of screen on time as all the clueless reviewers using my device for stuff that are more battery taxing than "WiFi browsing". Netflix + YouTube+ candy crush + tune in radio while using tapatalk and other little things. So using the device as described by anands WiFi browsing test I have no doubt it will be closer to the 12 hrs they got then the 7 the mobile blogs are reporting.
Stop being lazy and look into ( if they even disclose it) how all the other sites perform their test and compare it to what anand does.
Or go over to their post on their site and challenge anand on the testing method and results and see how that goes.
Edit. lets add in some results for smartphones for the same test. The nexus 4 =5.93 hrs. The iphone 5= 10.27 The htc one x = 9.93 The HTC one = 7.8 and so on.
Do you see these same results for the other review sites? NO. Why? Because they are not doing the same test. Comparing their ( anands) test to who knows what the others is doing is just wrong.
Ill even pull in stuff directly from one of the reviews you sited in your defense,
With no apps running while sitting idly on the home screen, the new Nexus was able to last for over 44 hours
The large discrepancy between idling and WLAN runtimes means users can get away without charging the tablet for a few extra days longer. More conservative brightness and system settings will also net much more battery life this time around.
There you have it. So a test like anands that is not loading webpages as often and letting the wifi radio idle more will clearly get better battery results then what they ran