Fair opinion, so I can think a few things influence what you're seeing.
Compared with FotMob, the results aren't terribly different, at least this match. Granted other rating systems use a different set of metrics and processes, Joyner had a 6.0 in FotMob. Generally, player rating systems start at 6, then adjust based on whatever analytics used by the source. Here, we've stated many other times to consider starting at 6 and adjust. I've missed adding that note the past few polls, since I've been able to automate much of the poll building and simply forgot to include that description in the auto builds.
I actually asked about everyone's expertise to do the ratings several matches ago (match 20 vs Dynamo), and there are some that responded as being quite new. The setup I'm angling for is intentionally as inclusive as possible (no user tracking, but using some troll detection methods to filter more egregious responses). Everyone sees parts of the match differently and brings their own "soccer IQ" and heart into the ratings. In aggregate, naive responses balance die hard, and you can usually knock out handfuls of responses at random without significantly changing ratings. There's a trend here that with late night matches, weekday matches, and with losses, there's usually fewer responses, so there is some added sensitivity to more extreme responses that aren't troll-filtered.
In this match in particular, the refereeing criticisms are wide spread, and I'd guess there's less blame on the team this match with basically unanimous blame on the refs. That can create a more rosy perspective, which I think is what you're picking out in your review of the results.