I just downloaded it. I just have to complete the annoying, time wasting captcha thing. It is very aggravating with a touchpad. Only moderately aggravating with a mouse. At least it is free, I wouldn't pay $10 to use it. I think that captcha thing came out as an extension of their skill test, and I think their skill test might have come out to appease the people who wanted to show that they can get good shooter results in a lower specced system.
I used to use it a lot more often. It was quick, convenient all in one way to check that everything is running well, and to see the results of tuning on a different way of testing. The hoops I have to jump through to run it now are a significant added annoyance though.
The CPU tests do seem to favor Intel, but they also favor normal consumer use and responsiveness for the most part. Biased towards better performance of lower numbers of threads vs scoring flat across them all, and biased towards lower memory latency. Both of these seem like good choices for the non technical user that would use Userbenchmark in the first place. For technical users with workstations there are more specific benchmarks to their use cases that would be more applicable. There are other CPU benchmarks that are far worse, like 3DMark CPU tests in gaming benchmarks that are often wildly disproportional to relative gaming performance.
They are not perfect. I think that the memory latency part of CPU performance should be replaced by a system memory latency score that adds a multiplier for the performance in the more frequently accessed lower sized areas to better reflect the added benefits of large cache. But you can't have everything.
And the CPU reviewers who do the text writeup are definitely Intel biased. Not as bad as trash talking commenters on some sites, but some do sound in the same vein. Maybe the reviewers are trying to push back against what they see as pervasive bias for AMD on many tech/tech media sites? Maybe they are trying to drum up some hype and targeting some benchmark entertainment market? Get free media exposure?
Also the results give you a lot of compliments where other benchmarks just give you numbers. Which also sets this software apart from others with a less technical, more entertainment bias. For example:
https://www.userbenchmark.com/UserRun/67297088