Still, however, the worst coinjoin is probably better than the best centralized exchange when privacy is at stake.
Equally bad, in my opinion. Privacy enhancing services are reputation-based. If you have a bad reputation, I won't trust you. Judging by the (not so recent anymore) events in Wasabi, I would put it in the same rack with centralized exchanges. Honestly, even if the former is a mixing service, I cannot trust it my privacy in the slightest; if used, Ι'd consider it invaded, just as with centralized exchanges.