It's not that he didn't fulfill expectations, being a nearly 40g scorer likely exceeded them, it's how far his game devolved in the grittiness.
Pre Chara, he absolutely would get to the crease and bang in goals. Post Chara, he stopped being a power forward.
Knowing where he came from helps understand where the disappointment comes from. He became softer and more perimeter as his career went along. It's understandable, it's still a bit of a let down knowing who he once was.
Also shows that he's more risk adverse and thinks about his future, breaking your neck does that.