I agree with you to some extent Clare, and I freely admit that some people on certain forums can be a little militant. However, the whole point of Blu-ray is to experience films with the highest audio-visual quality. Why else are we paying the premium? If we're unconcerned with such thing we might as well go back to VHS. Screen caps can be very useful for identifying visual flaws and are often indicative of problems, if not entirely representative. These Blu-rays clearly have issues, which are readily apparent from the screen captures (although admittedly I've only linked to two). I spend plenty of time watching BDs and perhaps that's why I'm more susceptible to such things. As for which TV service, it doesn't really matter. The issue is that it looks better than the BD release, which isn't right. As for which BD player, that's not an issue either, because these caps come directly from the disc in an unfiltered form from very reliable sources.
To the_lhc, I guess you are missing something. The BD screencap I posted has far less detail than the MPEG-2 cap (that's the second one). DNR has all-but obliterated fine detail (the absence of grain is obvious when you look at the walls, the wooden arch, Gandalf's face and cloak), and there's a lot of edge enhancement in other caps. This indicates that the BD transfers were taken from old masters or were filtered to within an inch of their lives. Any 'improvements' you might think you see are down to contrast boosting and slight variances between the colours in the two caps.
As for Dark City, it's widely regarded as one of the worst examples of DNR on any BD release. Everyone looks like Odo from Star Trek DS9 and the DVD is similarly afflicted.
It's disheartening when stuff like this passes for acceptable (or even good) when it really isn't. Something like Braveheart is a recent example of a great remastering job, and I can't believe that was in worse shape than the LOTR films.