I don't dislike West the way you do. If you really want to be open-minded, I'll tell you what I see about West.
He's playing out of position, and he's under-sized to be playing the C. But he doesn't have any choice, and neither does Pop, IMO.
When opposing bigs get shots up against him, they can make him look pretty bad. But what I think a lot of people don't notice are all the times that he denies his guy the ball, or forces him to give it up. I think he does that more often than most people are giving him credit for.
Put those things together, and it means that when he lets a big man take the ball close to the basket, he gets lit up. He does a lot of work to keep that from happening too much. He burns a few extra fouls because of that, but he commits a lot of his fouls on the floor, which doesn't give up FT's.
I know you don't like him, so you're not going to like this. But his DRtg this season is 94. Kawhi's DRtg is 92. That doesn't mean he's nearly as good of a defender as Kawhi, obviously. But what it does mean is that his RESULTS haven't been nearly as horrible as it seems, when you watch those plays where he does get lit up in the post. Tonight is a good example. I posted this in the game thread, but I'll risk repeating it here. Tonight, in the second quarter when everyone was screaming about West/Diaw, the Nets scored 8 points in the first six minutes. In the second six minutes, when West and Diaw were out, the Nets scored 10 points.
I'm saying that he's a career power forward, being forced to play as a center, against legit centers. He's going to lose some battles, and those will be very visible. But when you look at the outcome, he's doing a pretty damned good job holding his own. To me, it's like people saying Kawhi isn't a legitimate .500 3P shooter. Well he is, as long as the ball is going in the hole. The only thing that counts are the results, and while a guy might get "lucky" for one game, he can't stay lucky for 30 games. All I can tell you is that West has started 7 games this season, and the Spurs have won all of them.
One other thing worth mentioning - West is shooting .571 from 10-16 feet, and .515 from 16 - 3P. That's better than most guards shoot from 3-10 feet. He's got a legit mid-range game. Actually one of the best mid-range games in the league. He bails out a lot of possessions when he's in the game, with those mid-range jumpers. It would be nice if he was a 7-footer, but he's not. I think he gets by with it by playing tough and smart. I know you see things differently. I'd like to see Duncan start, and play about 15 total minutes. If not, count on seeing West, IMO.