I think Schumacher did have good drivers to race against and maybe some from his early days could have been World Champion had it not been for Schumacher--I'm thinking about Gerhard Berger, for instance.
Then there are those who took a title or two while Schumacher was in contention--Hill, Villeneuve, Hakkinen (acknowledged by Schumacher as his most important rival) and Alonso in his last two years.
I always insist that neither Schumacher nor anyone else should have to beg for forgiveness just because it seemed like they had it easy. Like it or not, Schumacher raced in unique circumstances against the drivers who were on the grid at the time.
If there are new world champions over the next few years it might start to look like the eighties and nineties, when there was no dominant driver year after year (perhaps Alian Prost with his 4 titles was the most prominent). But then maybe we'll see Raikkonen and Alonso dominating over the next two or three years, meaning that variety would be kept to a minimum. We'll have to wait and see.