No, he's not. He's vastly underpaid at the vet minimum. Yes, he's limited to 20 minutes per game but still is playing at a high level. He's not at ring chaser level like many of these vet mins.
High usage while he was on the floor - just under Butler, Klay and Dirk and ahead of Bosh, Conley, KAT. Above average shooting and high assist rates (turnovers high too).
3rd last year in RPM among SG behind Harden and Butler, and only guy over +1 oRPM and dRPM.
If he can do that in even 15 minutes per game to run the bench units, he's worth well more than the vets min.