Which question?
You can't cite polls like that because 19% may say he's the greatest ever and the other 81% may say he's the worst. You can't be crowned the greatest in 44 way match-up with 19% of the vote.
And like I said, you can't only focus on am minority's extremely high opinion and say he's overrated overall because of it. If you said he's overrated among his core worshipers I would actually 100% agree with you, but the country as a whole has a much lesser opinion of him. But not that low (ABC poll in 2001 said he had 64% retrospective approval).
Well if you're going to say a highly popular President isn't overrated, one would think you would tout what he did in his presidency, not just try to downplay his immense popularity.
And as far as trying to downplay it, stop. He's considered a god among the Republicans and many Democrats and independents like him and voted for him.
What do you mean I can't cite polls like that? He's considered the best President ever by the most number of people in the poll.

That's saying something. The other 81% don't all dislike him and you know it.
That 2001 poll that showed him with 64% you cited confirmed his popularity because 51% means you're doing pretty good in this cynical polarized climate.
He won in 84 with the largest electoral victory ever. He won 49 states. That will never be done again. The term "Reagan Democrat" is still part of our political dialogue today.
You'll get nowhere with this angle because his popularity is undeniable. Maybe should tell us why he deserves it since he's top 5 and not overrated according to you.