Yeah, he definitely should be.
He's 5th out of 6 players averaging over 27 points, and of those guys he plays the least minutes, in addition to being the most efficient scorer.
My list:
1. Harden
2. Westbrook
3. LeBron
4. Durant
Then Leonard, Giannis, Butler, Curry, and Isaiah fighting to sort themselves out. Leonard stands out among them as of right now.
Also worth noting that Westbrook is probably the only one with as little help as IT (and Celtics have a better record).