He was a good manager, mate. I don't think it was a social/communication thing as much as it was just losing VDV, Modric, Ledley and Bale in successive seasons: he'd set the team up around Bale after Modric left, but when Bale left he ran out of ideas and we spent the money on players he didn't necessarily want. Similarly, VDV and Ledley brought a lot of intangibles to the club that probably disappeared when they left and a personality/leadership gap was created.
The thing about AVB is that I really don't see him as a charismatic leader type, the sort of person who could fill that void: we have Poch now, who absolutely is that sort of person (by all accounts, even though he's generally a bit of a wet fish in press conferences and in public
), and he's provided the leadership our side needed to become as good as it is now. But AVB had a situation that was crying out for a Poch-type manager (as you say, the post Bale/Modric era) and his character (which is more suited to being the sort of reserved tactical organizer that's more common on the continent) didn't allow him to rise to it, simple as that.
Bale absolutely loves the guy, for example, and a lot of his players at Porto have spoken about how he shaped their game and their personal development. It isn't a stretch to assume that he can gain players' loyalty at about the same rate as any other manager: he just wasn't able to steady the ship as we lost our best players in successive years, by dint of being unsuited to the role.
The whole 'he's an awkward croaky-voiced bad communicator' thing comes from the hacks at the Mail and the Sun, who never tired of making him the pantomime villain as some sort of imagined payback for the way he treated Chelsea's old English cohort in 2011/2012 (who probably were the ones who spread that rumor in the first place). It's all history now, and we have a good manager (perhaps very,very good) who combines being a naturally charismatic leader with being a tactical savant: but I'll still defend old Andre as heartily as I can. Because of the win at Old Trafford, the win against City, the win against Arsenal, the development of Bale, the accumulation of 72 points, the highest total the club's gotten in the PL era..