He's pretty obviously the best Russian player. He's very close to being one of the best players in NHL history, period. He'll eventually win a Cup too, and when he does that will pretty much solidify it.
I would say if Ovechkin retires tomorrow, he's the second greatest left winger in hockey history.
Ovechkin has 475 goals in 760 games. Fedorov had 483 goals in 1,248 games. Clearly different players, but 8 goals and 488 games is amazing.
He's more of a goal scorer, so he should score more GPG.
I think when he retires, he'll be considered by experts as the best Russian player in history. Ahead of Fedorov, Tretiak, Fetisov, Makarov, Kharlamov, Bure and others. He's putting up big numbers in a league where that isn't done anymore consistently. He's led his team in goals and points every year he's been in the league.
Even if he never makes the Finals, he'll likely be regarded as the best Russian player ever. Maybe not by people back in Russia, but by most NHL experts.