Personally, I think that half of these reviewers already have an idea of what they are going to write before they get to the review.
It seems to me, that the 50d, and 7d, do not come delivered, with the settings correct for taking the 'best' images in a 'point and shoot' type of way. It seems that there are some settings which most people on this forum make almost immediately after getting the camera (ALO, HTP etc.), and then they have to work at getting other settings correct for their style of shooting. (for example, I think Grumpybadger has made settings to the way that the focus tracks birds).
These 'journalists' are interested in getting their words in print, that is what they are getting money for. If they do not want to like the camera, they are not going to put the effort in to make sure that it focuses correctly. They will grab whatever lens they have to hand, and use that to take example test shots.
Yes, the 50d has noise if you view the images at 100% magnification, however, if you are /able/ to frame your shots correctly, and expose correctly, then there is little detriment to the extra 5mp over the 40d.
If you are getting the 7d, then there is a definite reason why you would chose this over the 5dII, they are intended for different audiences. There is a possible reason why you would chose it over the 1DIII (around £3k).
If you are going to use ISO 6400, there is a reason why you are going to use ISO 6400, probably you don't have a lot of choice.
There does appear to be softening in their photos. Perhaps they were using an old version of DPP, or an old firmware, or perhaps they had their aperture value so high it caused diffraction to be noticable.
But then again, I don't think the 7d was slated to be a landscape camera, which by their (Darwin's) admission, is what they are interested in.
Reading the Darwin review, I get the distinct impression that he did not write it, it was Samantha. Yes, I understand that it is in the third person, but the comments are somewhat lopsided.