RP were 4th in the WCC that year, behind Merc, RB and Mclaren. He was 4th in the WDC, and scored 125 of his teams 195 points (a greater percentage than Vettel managed when he replaced him the year after). Beat an RB, both Mclarens, both Ferraris. If you don't think that, or anything he did before that is impressive then clearly you just don't like him. Comparing most drivers on the grid to a Hamilton or Verstappen is unfair, they are going to go down as two of the all time greats, so it's a pointless comparison and completely meaningless in this discussion.
Also in 2021 he only scored 36 points less than Bottas. The difference on the WDC if he'd driven a bit better compared to what happened in the last race (14 point swing due to him/Masi) would have less effect imo. He also may have cost Max points as well.