It's mostly not astroturfing, it's just people are collectivists who want to join in when they see something buzzy and therefore have talked themselves into Andor being this good (and imo seeing something that's not really there). The critics are just trying to get views from the Andor trendsters. Disney might have started the snowball but everything after that is people organically overrating it because they saw other people overrating it. Now as a result of this Andor will probably be one of the best reviewed dramas on TV for the rest of its run. Because one day (possibly with Disney starting the snowball), it became buzzy.