Stamkos in this generation, versus expectation and skill level. Thornton and the Sedins, and Marleau did little for me in the previous generation (if one separates these). Bobrovsky was awful outside of that 2019 series, but there's potential that he's turning that around late in his career on a team that can play D (this year and last, of course).
Marcel Dionne, on his one line team, became a little easier to deal with in the postseason.
Andy Bathgate in the O6 era, same could be said there.
Alexei Yashin seemed to leave a lot on the table, not that his teams were stacked. Selanne is kind of weird case in this regard. His stats probably are too strong of a case against his contribution,.but he still seemed to leave something on the bone...it also felt like he was always against a buzz saw or he was hurt...
No one should have expected anything from them, but Lalime and Cloutier flat out gave away series whenever they could it seemed like...