I have watched F1 since 1977,used to be very passionate about it,my opinion on Scumacher - I hate him.he represents everything that is wrong in modern sport.He has no conception of what the word "sport" means.He was a dangerous,ignorant and arrogant cheat and should have been kicked out of the sport permanently many years ago along with the people who came from Bennetton to Ferrari with him and destroyed the soul of what once was the greatest team in motor racing.
The statistics of course say that he is the greatest ever but he could never imo be fit to to mentioned in the same breath as Senna,Fangio,Clark etc, or my own personal all time favourite driver Gilles Villeneuve.
If he is in a competitive car he will be quick and will win races.Wether he wins more championships will largely imo depend on wether he is allowed to cheat on a grand scale as he previously did,and wether Mercedes will be a team which wants to systematically cheat and ingratiate itself with the FIA to a degree whereby they know they will get away with it.Time will tell I suppose.