Severance was probably my favorite series of the last few years, so it's a high bar. That said, I obviously enjoyed 3BP more than you. There are things that aren't perfect (the forced dramatic tension involving keeping Saul in the dark in the final episode springs to mind), but I really enjoyed the ride and the performances. It's impossible when watching something adapted from source material not to be informed by it, so I don't know how that impacted my viewing.