It's a tricky situation to evaluate because who knows what he's thinking tactically.
Right now, we're losing the midfield battle every week, he hasn't made any changes to address that, and our performances have been poor (even when results have been good). Fair or not, any manager who spins his wheels long enough on the same problem starts to look like he doesn't have the answers. The squad is certainly a factor but it's still odd that he'll change the front three around or drop an attacker for a centre back before adding another body in the middle.
I think this is where a lot of managers do themselves a disservice. Never discussing any of the logic behind their team selections, instead focusing on vague platitudes like hard work, fight, aggression, etc. It doesn't really matter how hard your players fight if they're consistently outnumbered in the areas that matter. What are we gaining by setting up in a 4-4-2/4-2-4 and pressing high up the pitch every week?