Westside, on my understanding, is a pretty good approach- especially if you like to mix things up.
However, in my opinion, the further away from the the competition lifts you move the less the training will transfer into bigger competition lifts. So, for example, doing Max Effort goodmornings may increase your strength in general terms- but will not produce optimal strength development.
I also think when I have heard Westside people talking science the system sounds great, but frequently in practice the decisions about loading, rep ranges etc are kind of ad hoc and not thought out. I think often there is a confusion between demonstrations or tests of strength and building strength. They latch onto the idea that strength is best developed with loading over 75%- but what seems lost is that just as loading is a form of specificity- so is the movement- and volume (or the amount of movements) is easily as important as the amount moved- or rather the other part of the puzzle. The Russians have worked out templates based on their ideas about how to pack in the most amount of movements in the appropriate loading ranges and not overtrain. Westsiders have another way of tackling the management of fatigue- but without precise programming I think it tends to be hit and miss.
Again- I am no expert- so thats just my opinion. Some athletes are better suited to high intensity as opposed to high volume- and they don't need the specificity as much- I guess westside would work great for them.