I’m not Keith but You can add comments to watched activities if you choose. and do star ratings on things. Actual user reviews like one from the professional credits on detail pages is something that is planned afaik
I peruse the activity feed regularly to see what my friends are watching and just click on it to see what something I never heard of is regardless of how my friends may have felt about it. most stuff I don’t care about for sure and I have muted friends who let their kids watch Peppa Pig 30 times a day, but I’ve found some gems. Like the new Planet Earth III which I did not know was a thing.
more in linked above about an hour ago.
but here is is again. Discover Together: Public Release - #3 by PlexInfo