The report specifically stated IE 10 as one of the five most popular browsers, which is an untrue statement ... if they specify version, the version they specify needs to meet their qualifications, which it does not. It did not test the security of the most popular versions of IE (9 and 8). That's dishonest.
WHO CARES about integrity in advertisements claiming to be unbiased reports despite failing a cursory examination? I do for one, as would anyone who cares about valid and accurate information from honest sources. I don't care what the NSS lab's credentials are ... this report is self-evidently false. Integrity and honesty are not trademarked logos to slap on something and scream that you have ... they have to actually mean something.
IE has earned a reputation for horrible security, vulnerability worsened by its deep integration into the Windows operating system. The easily un-verified falsehood I found on the surface of the report establishes that the report is not credible. Anyone citing or relying on such an easily discredited report are themsevles being dishonest ... this refutation of the report does not prove or disprove that IE 10 is or is not secure, but such an obvious falsehood in the report coupled with Microsoft's renowned history of promising every new iteration of an old product is better, faster, more productive, more secure, etc. which has rung false so many times (yes, I am aware Microsoft is not the only developer guilty of this, but given this report tries to dismiss IE's earned ill-reputation while the report itself presents a false claim as to IE 10's marketplace dominance, for the purpose of this rebuttal its very relevant).
Popularity and honesty are not congruent. If you are able to convince 99.9% of all computer users with a false report like this that IE is secure, that does not mean IE is actually secure. No one who buys a Windows computer has an option to not have IE, so even if popularity were a valid measure of security, in the case of IE, its a fraudulently inflated market share that only exists due to ongoing antitrust violations by Microsoft.