Bit surprised to feel the need to come to MLB's defence but I don't think fair to be so brutal.
He's always given good service to the club but has his limits, which show when squad under pressure and he's tested (and far from first time during his tenure).
As far as I can tell, he always does what is asked, even when stepping into first- or even second-choice boots too big for him (and many players), and seemingly uncomplainingly and with good humour. And a good injury record, particularly for such as a physical and hard-working player. Not surprising it doesn't always come off when so much being asked off him, but also times when it does and he makes a material difference in a win. Comparison with Mills (first-choice money?) is unfair.
As others have said, MLB just may not be an inventive decision-maker, as we could see when he steps in and gets snaffled as we as fans scream for him to flick the ball out wide or do something creative, or gets flummoxed in defence, and so may get badly shown up when selection and structures are a toss-up, on-field leadership and direction in flux, and he's asked to add nous -- ie. as right now.
Because he's currently a villain of the board, we focus on his screw-ups but for every one I see, I also see him pull off something significantly useful, which also shows a lot of heart. And remember, when a forward gets carded, it tends to be MLB (or Bassett) who rock up as covering wing-forward (or charge in to add umph to get a rolling maul over the line) and often to positive effect.
There's only so many world-class or top-class players anywhere or in any single squad, let alone in a group decimated by injury and illness where the remaining players standing must be perpetually knackered, so I think we could show a bit more generosity of spirit rather than roasting squad players for not being infallible, match-winning superstars. For them, I imagine they can feel they are only as good as their last game or their injury record, especially when contracts are in the offing, which could be one hell of a mental challenge.
I think it's great and justified that we give so many Championship players a chance, and quite a few a berth, particularly to mix it in/up with a squad that is so well populated with international quality and a strong Academy. He may not be a Bassett, but MLB is also a credit to his cadre. I have no idea on stats, but it feels like we've given dozens of Championship players a try-out under Dai and Lee, and a good number a home, albeit perhaps with a better success rate in the pack.