It's not just that he "isn't a particularly good shooter." John Wall isn't a particularly good shooter. Russell Westbrook is a TERRIBLE shooter now, and he compounds this exponentially by the fact that he also has one of the worst shot selections in the league.
Westbrook takes in injection in his knees to play. We all knew when his athletic ability went, his shot and game would suffer.
So what you are saying is he flipped the worst contract in the league to get a better contract AND first round pick? Seems smart to me. I can't tell if you are complimenting the guy.