I expected little from Pirlo, no scudetto was fine by me and even losing to Porto was understandable but after 40+ games he has no formation, no plan, no build up play, no defensive stability shows he is beyond incompetent. The absolute minimum would be he picked one formation and stubbornly uses it in all games. At least we'd beat all the lesser teams and probably fall short against the better teams. Had we not dropped so many points against relegation teams we'd be fine losing to Milan, we'd have known Pirlo's limit and made the appropriate changes next season but this is a total disaster.
Also, all of those people asking for Gasperini/Inzaghi etc need to look at the table carefully and realise that they are barely better than Pirlo so we should only be looking at Allegri level coaches or being brave and appointing a foreign manager for a real and meaningful change.