AWB is really good if he's up against a dribbler that he can just focus on 1v1. Probably one of the best in the history of the game.
But even defensively he has quite a few weaknesses which we saw many times over the years, and West Ham fans are already complaining about the same things going by the quotes above. Positioning, being lazy getting back, ruining our offside line, covering crosses at the back post. He improved some of those a bit over the years (most notably the back post crosses) but it's still not something he's actually good at. Just not the huge weakness which it was in his first few years here.