OTOH, everyone, including myself, were highly curious to see how Michael would fare at his age, after 3yrs out of the sport. IMO, I think many of his fans expected too much and continue to do so.
Had the Mercedes been the car he appears to have been lead to believe it would be, then I think I would have found 2010 very disappointing. Although having said that, he didn't start badly for someone out of the sport during a number of rule changes that made it somewhat different to last time he was driving. But his attitude when it was becoming clear the Mercedes wasn't going to be challenging for more than a podium at best now and then suggested he was quietly biding his time for the team to come good. Yes, he was rusty, and maybe age did more to reduce his adaptability than his overall speed, but he didn't come back to trundle around in the midfield, much as sometimes one wants to think he was her for the love of the sport, and not the highs of success.
2011 was much, much better. I would say that for at least the latter half he performed as well as I could have hoped - In the first half he wasn't at all bad either, but maybe an element of desperation in him to prove himself, coupled with a car that left him in the middle of the GP2 crashaholics, caused him a few too many problems. But more than that, driving a midfield car to the best it can manage is never going to look as impressive as driving a front running car below par if you only look at points.
2012 really matched my expectations, it's just sadly so did the Mercedes. While many were saying "they'll get on top of it, every team is having issues with something" for the first 5 or 6 races, all I saw was the chaos and circus suited antics of the Brackley team since they first imposed themselves on the grid (I had the misfortune of going to the Autosport show the year BAR launched.. With their twice or more daily "unveiling" complete with naff Pollocks video and punchably smug Jardine presentation). Nearly half the points gap between the two Mercedes drivers was down to one race - One of two races this car had any shine whatsoever to it. And instead of a 1,2, finger trouble saw an 18 point deficit and a 1 none. Of course, the other weekend the car looked at all strong Schumacher looked by far the stronger driver. And even aside from his (uncalled for, IMO) penalty from the previous race, or the usual Grosjeaning start, the car failed him. To this day I cannot make my mind up whether I'd have rather seen him heading to a certain win when the car failed, or if it was better he was stuck mid points when it did the inevitable.
So although this is another recap, I would say that for the first year, or at least most of the first year, I was disappointed by Schumacher. Even taking into account age and time out of the sport, he just seemed to not be showing the magic that had first caught my attention nearly 20 years ago. But for the last two years, overall the disappointment has been with his determination to stay loyal to, and believe in, this shambles of a team. His speed, his racing spirit, his sheer talent has shone through enough that I believe had he been in a Lotus, Red Bull or McLaren he would have been a constant front runner, and more likely than not title contender.