SILO is one of the better sf shows I've watched in recent years. On par with something like THE EXPANSE. Relatively self-consistent, decent twists, still got a bit of energy in the plot reveals going into the third season, Rebecca Ferguson is very good in the lead role. Suffers a little bit from "HIGH RISE SNOWPIERCER syndrome" where making the entire built environment of the story an analogy of ultra-basic claims about social formation feels a bit "young adult". Still a very good show though.
PLURIBUS is overrated. Not a bad show but really not that interesting or clever, and I started finding it tonally unpleasant. I feel similar about SEVERANCE or BUGONIA, those who like that kind of campy disjointed misanthropy might enjoy it. The non-sf satires that delve into similar territory such as BEEF and WHITE LOTUS are better I reckon, they're less vapid, ever so slightly more grounded, and quite a bit more clever due to having to be more accountable to a recognisable reality.
Both PLURIBUS and SEVERANCE give me an overpowering sense they're only getting in the way of my understanding anything more about real life, they're a bit like US by Jordan Peele: there's some kind of pretension to social comment there but it's lost in a flurry of showrunner masturbation.