"Winning AC Milan" - 6th and trophyless for the last few seasons, winning the cups, CL and league in the season after his appointment.
Real Madrid hadn't won the CL for over a decade before he got there, did in his first go.
He'd only won the league and cup with Chelsea, so clearly was crap there.
If anything his league record is usually a bit meh - he was sacked from Napoli for that same reason as they'd not won in 6 or 7 games or something, despite smashing teams in the CL and being top of their group. He's the Europe God though.