A few caveats are in order - the squad is average, I honestly think it's a top eight squad, nothing more; it needs major surgery.
However even allowing for that Ange is underperforming - three things seem clear to me, two of them undisputable at this stage:
1. Ange wants to play front-foot, attacking football, all the time
2. Ange and his team cannot (or are entirely unwilling to) organise a defence
3. There is no in game management to any serious level (and this is more debatable, I think)
Two and three make his position untenable.
Also don't get the cult around him - one to one he might be an OK guy, I don't know, but he comes over as prickly, arrogant, sullen and boorish; entirely unable to take on board different views and opinions. I get the impression of a strong-willed guy who has managed to impose his personality at a lower level, but when more sophistication is needed, he's found wanting.
Anyway, give him 'til Liverpool CC 2nd leg, then if we're booted out a caretaker can come in to the end of the season. Mason, Doris the Tea Lady, Levy's secret lovechild, fuck knows any more.