Many think that Federko got into the HHOF because he was lucky enough to be among the first offensive stars of the 1980s to retire, scoring hadn't yet come down, and nobody knew yet that the high levels of scoring in the 80s were basically an aberration.
Federko was elected in 2002 so there was plenty of time to digest his career.
I think Federko is an underrated as a player by many. St Louis never really went far in the playoffs sans one year, but Federko always seemed to do well in the playoffs, at least as well as he did in the regular season.