The reason why THG's chart makes Intel look weak on the low-end goes beyond not including the E6400 and the E6300. Intel looks horribly weak in the low-end, because they didn't include Intel's low-end chips the 2.8GHz 915D with it's $133 MSRP and the 3.4GHz 945D with it's $163 MSRP. The 960D, 950D, 940D, 930D, 840D, and 830D are only there for reference, but are no longer favoured parts. The Presler and Smithfield stocks are supposed to be clear through the 805D, 820D, 915D, and 945D.
For the E6400 and E6300, they didn't include them because they didn't test them. Fine. They have no such excuse for the 915D and 945D. For the 915D they've tested the 920D before and the performance is identical. The case for the 945D is even stronger, since the 950D is on their chart already and the 945D performs exactly the same. Now, they say the relative performance of a 3.4GHz 950D is 1.45 and the relative performance of a X2 4200+ is 1.44. That means that the 945D offers better performance than the X2 4200+ yet only costs slightly more than the X2 3800+. This gives the price/performance advantage to Intel not AMD.
What's more, the 915D is going to be replaced by the end of the month by the 3GHz 925D. The 915D will then drop to the 820D's current $113 MSRP and the 820D will then in turn drop to the 805D's $93 MSRP. This means by the end of the month Intel's low-end offerings will be even better valued just in time to deal with whatever price cuts AMD's upcoming 65nm process allows them to make.