Just read some of their reviews and look are the ranking system Userbenchmark is heavily Intel and NVIDIA biased, they claim to be independent and only interested in real world results and performance but if you read any of their reviews and see what they say about AMD CPU's and GPU's then compare it to what they say in the Intel and NVIDIA...
Then they go on to call pretty much all of the tech media AMD shills who are payed to make Intel and NVIDIA look bad...
just read the Userbenchmark about and Q&A section it's good for a laugh.