There is a conflict of interest with dogie's guide, as he is now an employee of Bitmain, so it has lost a lot of credibility I'm afraid.
Considering the hardware he has received to write guides for, I think that argument would have applied a long time ago for various manufacturers. As it stands, the overview is still pretty a pretty good guideline (you can compare Dogie's top half/bottom half and Bicknellski's list), and any issues people take with it can be read in the actual thread (it's not self-moderated).
The thing is though, how can I be biased for / against every company at once? Patman has a personal vendetta against me, so I wouldn't care too much about what he says. Ps, I'm not an employee of bitmain, I'm an external contractor.
I have to agree, even if he did work for them, his reviews have been very objective. About as much as they can get. There are people hating on here, but he has done excellent work, and his body of work on the reviews speaks for itself.