Because they like to use them for more than a couple days. Usually at least a week, you can't get a proper review in a days use. That way you get a much better review. Good things come to those who wait! :)
This website is full of Nokia fans. You have to give the people what they want. In this case - it's Nokia first.
Also this website likes to spend more time with phones before they review. They don't use it for a day then pretend to know everything about it like MANY other sites. This is a good thing. Just be patient.
I know a review for my L822 won't be coming for a while because I believe the 8x is the next most popular compared to the L920. Fine by me, the people who run this site, like I said, actually take time to use their phones.
I don't think that the bias toward Nokia is as much as you guys make it out to be. The thing is that Nokia has been garnering a lot of coverage because they simply have been very active and there is simply quite a bit of buzz about their devices. I still chose an 8x after my lumia 800 because I don't see myself carrying a phone as big as the 920.
I'd hope that HTC is stepping back into business with the 8x and 8s.
Who needs a review from an individual when you can browse these forums and see exactly what problems people are having and what features work well? Admittedly it takes a little bit more effort to sift through a few posts but its way more reliable to get 40 peoples opinions than 1.