I agree with you alanschu, in fact I had said earlier that Marleau needs to maintain his current game for another few seasons to really be considered great. And really, Krookie is just saying Marleau is playing at the highest level this season, which is obvious to anyone who watches a few Sharks games.
He is only 30, so if he puts up 70-80 points for the next four seasons, which is plenty possible, that will give him decent numbers. He would still need to shine in the playoffs to really gain a better reputation though. His numbers are good, but not close to the HoF at all.
Although I hesitate to go strictly by points per game on measuring greatness.
As for Graves, I really don't know much about him, I was just saying that to bug Volo