I don't know how many of you are on Twitter, but Celtics Twitter really likes to hate on Kanter:

Here's the thing: Is it wrong to feel that way, though?
The following numbers are from NBAWowy:
Enes Kanter has been on the court for 56 minutes so far this season. 116 possessions.
In the time that Kanter has been on the court, the Celtics have scored 1.155 points per possession. In other words, per 100 possessions, the Celts score 115.5 points while Kanter is on the floor. The Celts have a TS% of 54.5 with Kanter out there. That's pretty good.
Problem: the Celtics opponents score at exactly the same rate. 115.5 points per 100 possessions. Opponents have a TS% of 55.4 with Kanter on the floor. Those are not good numbers.
So the Celts are about break-even with Kanter. That's not so bad, right? If your team is breaking even, that at least means things aren't getting worse while you give your better players a breather.
How do things look when Kanter is off the floor?
Answer: In 424 minutes, 893 possessions without Kanter so far this season, the Celtics score 1.15 points per possession, i.e. an offensive rating of 115. That's almost exactly the same as they score with Kanter. The TS% of the team without Kanter is 57.3%, which is actually higher.
Defensively, the story is very different. When Kanter is not on the floor, Celtics opponents are scoring 104.7 points per 100 possessions, with a TS% of 53.3.
In short, the Celts so far this season are approximately 10 points per 100 possessions better without Kanter than they are with him. That differential is explained entirely by defense. Of course, Kanter is an offensive player; we know that. He's supposed to be good on offense and bad on defense. But so far, his offense isn't really making the Celtics better on the offensive end, and his defense is definitely making the team worse on that end.
Caveat -- small samples, obviously. But these numbers are pretty much in line with what you would expect.
It's not like Kanter is underperforming relative to his career numbers, either. His per-36 production is slightly down compared to previous years, but he's getting to the line a lot more and scoring with greater efficiency. It just hasn't translated to the team being any better on offense with him.
What do you think?
Should Kanter see the floor?
Here are a few more numbers that may affect your opinion:
Grant Williams - 153 minutes played. On the floor, team is net +2.4 with him on the floor. (105.4 ORTG, 103 DRTG)
Off the floor, 327 minutes, the team is net +12.5 (119.9 ORTG, 107.4 DRTG)
Yikes!
Daniel Theis - 174 minutes played. On the floor, team is net +18.9 (118.1 ORTG, 99.2 DRTG)
Off the floor, 306 minutes, the team is net +3.8 (113.4 ORTG, 109.6 DRTG)
Robert Williams - 128 minutes played. On the floor, team is net +8.4 (124.1 ORTG, 115.7 DRTG).
Off the floor, 352 minutes played, team is net +9.4 (111.7 ORTG, 102.3 DRTG).
Vincent Poirier - 29 minutes played. 113.3 ORTG, 98.3 DRTG, net +15
Off the floor, 451 minutes, team is net +8.8 (115.2 ORTG, 106.4 DRTG)
Hrm ... well, it looks like the team is really good with Theis out there. Seems that Grant Williams is about as much of a net negative as Kanter so far. Rob Williams is close to breaking even.
The team has been surprisingly good with Poirier, but that's been mostly garbage time, so what can you really make of that?
A lot of this has to be a starters / bench thing, right?
Let's look at some lineups.
Kanter + Kemba w/ 3 of Smart, Hayward, Tatum, Brown:26 minutes, 52 possessions
121.2 ORTG, 105.8 DRTG, Net +15.4
Kemba + Theis w/ 3 of Smart, Hayward, Tatum, Brown:101 minutes, 205 possessions
116.6 ORTG, 89.8 DRTG, Net +26.8
Kemba + Timelord w/ 3 of Smart, Hayward, Tatum, Brown:47 minutes, 102 possessions
123.5 ORTG, 110.8 DRTG, Net +12.7
Kemba + Grant w/ 3 of Smart, Hayward, Tatum, Brown:15 minutes, 34 possessions
135.3 ORTG, 102.9 DRTG, Net +32.4
Again, pretty small samples overall. The sample for Poirier with the starters is so small (7 minutes, 13 possessions) that it's not worth listing -- though the team has been really good in that tiny sample.
I think what we can say for sure is that the starters are really good with Theis.
Grant Williams seems like he fits in quite well with the starters, despite his lack of size. His overall on/off numbers suggest that the team is perhaps hurt more by his lack of offense when he's out there with bench players.
Timelord looks like his impact is maybe not as positive as you might assume from his overall productivity. The team does well with him on the floor, but not that much better than they do with other guys in his spot.
Frankly I'm not certain what my takeaway is. It sure looks like the team is best with Theis, and maybe with Grant Williams as long as he's out there with the starters. But perhaps these trends will change as time goes on and opponents figure out how to exploit some of the Celts' more successful lineups.
If you're going to give minutes to somebody else, it makes sense to go with Rob Williams if you can, right? Because he's got a future here, and he's at least got potential on defense even if he isn't actually a net positive there right now.
I would say Vincent Poirier deserves more of a look, if anything.
Bottom line, an entire NBA career and a short run so far with the Celts supports the conclusion that even if Kanter doesn't kill you out there, he isn't that much of a help compared to other guys who could get his minutes.
I feel like sooner rather than later, if most of the center rotation is healthy, Kanter will be riding the pine.