I do think there has been some marginal change for the first time in a decade. He spent that decade complaining at everyone who told him he should alter tactics depending on the opposition. I think we finally, finally saw him do that in the second half of the season. We played very differently against City and then Liverpool. We still had no real plan for a game like Swansea, did he deem them not important enough to change our game plan or did he just not predict how they would play, I don't know.
Taking off GIroud when we needed a goal and putting a useless midget upfront when there were several slow useless idiots ambling around in midfield creating nothing... not his best move.
I still don't think we'll win the league under him, but seeing the first sign of a significant change from his tactics in the past decade is... somewhat encouraging. Not just that he finally conceded to advice from pretty much everyone alive telling him to play differently against top teams(which doesn't actually mean just put everyone behind the ball as Mourinho seems to think, you can attack in a different style against a different team if you want to), but that it actually had a positive impact in games we often/usually would lose.
Helped by Liverpool being no where near their best, City too, but even not near their best these are still the games we would lose in the past 5 years.
He won't buy the right replacement for GIroud, we're stuck with Welbeck who has been utterly worthless as was entirely predictable when he bought him. Wenger still makes terrible buys to go along with potentially good ones. He also is making the same sounds about keeping Walcott and giving him a new contract despite 1, the guy is constantly injured and 2, pretty **** when he isn't injured. The chances he can finish... almost anyone can, his wingplay is awful, he's lazy, selfish and stupid, but again huge wages on someone who is so rarely available is not great business on a genuinely game changing player, let alone a guy who barely puts any effort in and outside of one very specific type of chance is entirely useless.