As for the question of quality in terms of inductees:
I think that perhaps certain forwards who played during a high scoring era and were essentially good first line forwards but not franchise or superstar players were inducted because their careers were not evaluated properly.
Cross-era comparisons, evaluations and adjustments can be difficult. If you ever check out the History of Hockey board, we debate constantly about how to best compare players across eras. It can be tricky in some ways...
But it can be done better than the HHOF induction commit has done it at times.
In a given era, you can expect one transcendent talent or two.
Then you have your franchise players and guys who may not quite be franchise players but are superstar level players that casual fans have heard of and that people go to see and then you have your good first liners who may have one year or two of being big stars in the League.
When players from the last category are mistaken for franchise or superstar level players due to statistics that look really good in comparison to stats from lower-scoring eras, then you get inductees who were very good players but were never among the truly elite (or were only at the level for a season or two).
From recent times we have these players:
Generational: McDavid, Crosby, arguably Ovechkin.
Franchise players: Malkin, MacKinnon, Matthews, Kucherov, Kane, Barkov
Superstars: Rantanen, Kaprizov, Pastrnak, Getzlaf, Modano, Kopitar, Zetterberg, Sundin
Good first liners: Parise, Perry, Marleau, Tanguay, Hall, Voracek, Pacioretty
Players like Joe Mullen, Dino Ciccarelli, Dave Andreychuk and probably Joe Nieuwendyk and Mike Gartner (who are all in the Hall of Fame) were actually more in the class of players like Perry and Hall than in the superstar class but were inducted because of statistics that look like superstar numbers in eras like the Dead Puck Era and the 2010 to 2017 low-scoring era (that peaked in 2015 when an 87 point player won the Art Ross). Because of these inductees, people can now make arguments that players like Perry, Marleau and perhaps Hall wouldn't be too out of place in the Hockey Hall of Fame.
This isn't to suggest that 1970s/1980s "compiler" types are the only controversial selections. The HHOF includes guys like Dick Duff from older eras, defensemen like Housley and defensive specialists like Carbonneau and Gainey as well.
I don't know about that. There are threads asking if certain players should or will be inducted constantly.