HUB definitely slant (sometimes heavily) towards AMD IMO... however I absolutely do not believe that they produce unreliable data. I believe that when it comes to the numbers they present, they are factual and objectively what they observe during their testing. I also believe their methodologies are sound and believe they have integrity. I don't always agree with them, however there is definitely as much value in what they do as any other source.
I believe that they do what most other sites do which have inherent biases... and that is present the information in the best light possible for the side they lean towards when possible. And what I mean by that is going out of their way to rationalize why X might not be so bad compared to Y... if you take Z into account as well.
I watch both AMD leaning reviewers and sites, as well as Nvidia leaning reviewers and sites... despite my own preference being Nvidia. It's important not to limit yourself to just reviewers and sites you agree with, or that you know will hold the same opinion as you do because you're less likely to allow yourself to accept that others can be right to have a different viewpoint and that yours can also be wrong.