I like AWB tbh, he's looked exhausted for several games. He's going to be a very useful player to have in the coming seasons and will clearly improve. However, if Laird manages to make the step up then AWB will be under huge pressure as Laird is significantly better going forward. But even if AWB eventually loses his starting position to Laird (big, big if), AWB as a defensive option will be very useful and just allows us more tactical options. Clearly not money wasted and I think people expected far too much from a player entering only his 2nd top flight season. He's still a rookie.
I think it has more to do with people finding his lack of technique not acceptable. From all skills, improving the technique is by far the most difficult one. It is essentially the 'talent'. Players either have it, or don't. So, it is a bit hard to see AWB improving much on that aspect.
Of course, I hope that he can improve his positioning and aerial ability, in which case he would become a great defender. Probably not good enough for a title-challenging team (unless the other fullback is TAA-calibre of player), but quite good. As it is, he combines very bad passing/attacking skills, with great tackling but average/poor positioning and really bad aerial ability (only 40.6% aerial duels won from 59 attempts, Shaw has 56.6% success rate in 53 attempts, Lindelof is at 64% from 139 attempts, while Maguire is at 72% from 235 attempts). So, like it or not, one of the reasons why we are weak aerially is because of him. Nevertheless, he has the required high for that part to not be a weakness, but unfortunately, I don't see how his technique is gonna improve. People even have it, or they don't.
Hopefully Laird develops good enough to bench him soon.