I've been thinking about this too, was listening to MvsW the other week and they said Ovi was 9th in scoring since 1992 (NHL debut in 2005), fair to say he doesn't reach Gretzky but he might reach Bossy and Hull. Even if he doesn't, in an era where scoring is down, goalie pads are bigger etc he will surely go down as one of the greatest scorers the game has ever seen.
He also lost a season and a half to lockouts.
Where he ends up scoring wise depends on if the trend of allowing interference continues of if the league heads back to where it was after the lockout. He's certainly one of the greatest goal scorers the game has ever seen though.