In his younger years, Schumacher had some of those moments, where you truly start believing that the supernatural happened.
Much like Vettel's qualifying performance last season (compared to Webber mostly).
Then he had the advantage of having a run of very good cars at Ferrari, and still being an extremely win-oriented driver, to the edge of ruthlessness. These "qualities" are what make exceptionally successful racing drivers.
With Mercedes, the car never really was a winner's car during the last two seasons. This season, it can win, but so can about a dozen other cars, and McLaren and RedBull are usually more likely to, judging by performances so far. The car is similar in performance to the Ferraris, but there are more retirements, leading to the lower score.
And Schumacher isn't an as outstanding driver as he used to be 20 years ago.