Because he's not very good.
I can't get my head around some of the posts on here saying he's been our player of the season, or that he's been playing well, I can only assume we're doing it through a view finder where so little is expected of him that if he makes it through the game without doing an actual poo on the pitch we'll clap him.
For those saying that he's defensively sound and isn't costing us, have a look at the Norwich goal again. Buendia drives at Mads who should be showing him outside, he should be a yard further in so that Buendia hasn't got the option to cut inside on his stronger foot, but his body positioning is wrong, whether that's a mistake or it was a deliberate ploy by Mads because he wouldn't have the acceleration to stop Buendia burning him on the outside it was massively costly.
And as for his distribution? Well, I posted earlier that his lack of progressive passing was a problem and rather helpfully a thread on twitter popped up comparing him to the other CB's in the division aged 24 and under and he doesn't come up favourably at all.
First up his defending. Solid defender? Aye right.
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As you can see, not only does he have the lowest defensive duel success in the division, he also attempts a low amount.
You'd think for a big bloke he'd at least be an asset in the air though right?
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Well he's actually got the third lowest in the division for that aswell, winning about half of his 5 attempted headers per game. He's nearly 6ft 3 ffs!
You'd hope his lack of attempted defensive duels, and lack of attempted headers would mean he's doing well off the ball, getting interceptions, blocking shots maybe.
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Sadly not, again he comes up as one of the worst in the division for that aswell.
Now onto his distribution, playing in a team with one of the leagues most attacking left backs on his outside, in a team that dominates possession you'd expect his distribution skills to at least be up there.
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Nope, still in that bottom box, I was baffled to see some posters earlier say that he was more progressive with his passing than our other centre back options.
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Now here's the one thing he does succeed at, passes per 90 and the amount he completes, in isolation this is a good stat, in conjunction with his progressive passes though it shows (and it won't be a surprise to anyone who's watched us) that his passes are going either back to Raya, or square to the other centre back in the hope they'll do something. There used to be a few accounts who done pass maps but sadly they haven't done one in a while, the most recent being the away game against Swansea where we had the lions share of possession.
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And MBS is the least threatening outfield player, despite Pinnock playing on his weaker side.
MBS hasn't became a whipping boy for no reason, he's gotten allot of stick because quite simply he's not particularly good, visually I thought that was obvious but the data backs it up pretty conclusively.
I'll back any player who pulls on the Brentford shirt but he needs to improve a massive amount.