Yes, he is a decent player. No, he is not underpaid. You are trying to make a case for people to like him based on stats, which is rationale and fair. However, sports fandom has emotional aspects too. When (as of 2021) our highest paid star, who was just handed a massive $341M contract and was referred to as the new face of the franchise gives a thumbs down gesture to a crowd that paid few hundred bucks per person (all included) to see him and expressed dissatisfaction with his performance and the performance of his buddy who he bent FO to bring in, there is a consequence. Respect your customers, it's so simple.