You have an unbelievable prescription for the glasses you're wearing. I don't see "love" for Perunovich here, but that we notice he's looked way more comfortable handling the puck and making some defensive plays. No one is going to defend the powerplay because it's been awful across the board, but to pretend like he's been beyond usable is incredibly dishonest.
As far as I know, there isn't a stat readily available for all turnovers, but we have giveaways that are an ok stat, and he's had 3. Per 60, he's basically tied with Krug and about 30 points above of Parayko. Eye test will help a little bit with that, but the games the Blues have been playing have seen possession changes every like 2 seconds. Him falling down was cringe, but sometimes it happens. If he keeps doing that then I'll criticize him.
Mikkola couldn't handle a puck to save his life and made questionable defensive decisions despite being touted as a good defense-first guy. Perunovich has been touted as a good puck moving defenseman, which in the recent games, he has been. The annoying thing about your criticism is it's the same as Dizee's. He hates Kyrou and will constantly talk shit about him without giving him credit, or if he does, it's with massive reluctance. You hate Perunovich and that's fine, but you conveniently ignore the plays he broke up with smart defensive decisions or surprising strength on the play. I can think of two off the top of my head that he broke up last night in a barn burner of a game. Also was a +3 along with Scandella in 10 minutes of even strength ice time. Whether or not +/- is a good stat, being a +3 with 10 minutes of ice when 5 goals are scored against is pretty good, and I think it's ok to note that.