Senna's golden age was in dominant McLaren, he didn't really have to reinvent them as Schumacher did with Ferrari. Just my humble opinion.
well you could say that he did bring Honda along with him from Lotus then you could add he had to go against a multiple world champ as a team mate so i wouldnt say he had it served to him on a platter, quite the contrary Schumi's results that impress you were 
and whats with this reinventing BS? so what he could throw $$$ around to his old teams main technical guys that aint hard. 

Hm... I think Prost took just one title while he was Senna's teammate in McLaren. Without Prost, that would be Senna's 4th.
It is still far-cry from Michael's 7.
Of course, things might have - probably would have - been different if McLaren Honda managed to keep their superiority. Well, they haven't. Another thing is, McLaren was already strong when Senna joined them, having won '85 and '86 with Prost. There was no reason to reinvent, to rebuild McLaren. Honda engines have brought extra performance, but McLaren was far from poor without them at the time.
On the other side, MS came in much more mediocre Ferrari. He didn't bring any hardware with him, but he did bring Ross Brown... some other people, I believe. What he managed to do with Ferrari was magic. I don't like him at all, but I can't deny him that.
Now... we can go on and on about how much of that was Schumacher's doing. Would any other decent driver be able to achieve the same? Was he just lucky to be in Benetton and move to Ferrari at the best possible moments? What would Senna achieve if McLaren, say, managed to put their hands on Renault engines once they turned out to be best in the field?
There are so many ifs and so many alternative outcomes, but in this reality, Schumacher took 7 titles (score no-one will challenge for years, if ever), gave 5 consecutive titles to Ferrari (after they experienced 16 fruitless constructor years and 21 dry driver years) and left Ferrari strong enough to keep challenging and winning.
I'm sorry to say, guys, but that is one tough score to beat. And that is reality we live in.
You can have it in any colour - as long as it's black. Or red. Or blue. Or green. Or white. Or navy blue. Or...