Sorry but if he was not a Leaf he probably would not have gotten in.
You quote me noting Sundin's stats and yet don't comment. Then you just say he only got in "because he was a Leaf".
To reiterate:
Games: 1346
Goals: 564
Assists: 785
Points: 1349
Points per game: 1.002
How many point-per game players with 1300+ points are not in the Hall of Fame? In all NHL history? I actually looked it up, it is precisely one: Pierre Turgeon. These simply are "automatic Hall of Famer" stats.
Sundin is 28th in all NHL history for total points... and all the eligible players from 1-31 are
already in the Hall of Fame (#33 is, you guessed it, Pierre Turgeon) and of the top 50 list only 5 who are eligible are not in the Hall: Turgeon (#32), Roenick (#43), Nicholls (#45), Damphousse (#46) and Brind'Amour (#48).
And Sundin's place on that list isn't just due to extreme longevity offsetting a sub-par per game scoring pace (eg. like say Alex Develcchio), if you rank the Top 50 list by points per game played Sundin is right there at the same place at #28 (a few thousands of a % behind Selanne and ahead of Jean Rattelle).
You can look at the list yourself if you want:
List of NHL statistical leaders - Wikipedia
To be blunt, the numbers say Sundin is easily a Hall of Fame player regardless of which team he played for.
That is why he is in the Hall of Fame, and why this "controversy" seems to be within a certain sub-set of posters here on HFBoards rather then the HoF voters themselves (who elected Sundin on the first ballot). I get that some hockey fans greatly dislike the Leafs franchise; they have half a century of post-season failure and yet still have an enormous fan base (and consequently the biggest media presence in Canada) which can seem like it crowds out other teams, but you should be cautious not to let any personal bias colour your opinion of a player's career.
If he was the highest scoring German of all time should he be in?
Yes, except unlike Germany, Sweden has multiple gold-medal winning national teams (including during the best-on-best era) and a history of elite NHL players going back decades... you know guys like Lidstrom, Salming, Forsberg and current players like Karlsson and Backstrom. You know, your average 3rd pair/bottom-6 scrubs
Is a PPG player in a higher scoring period really a hall of famer?
That is a good question. Why don't you ask it of all those guys from the 80s in the Hall of Fame who got in... with lesser numbers then Sundin (eg. Ciccarelli, Andreychuck, Robitaille), playing in an era where it was much easier to get points then Sundin's era (90s to early 2010s).
If you want to make the argument that Sundin's numbers are not worthy of a Hall of Famer, you have to deal with the fact that there are dozens of players out there who are in the Hall with worse numbers. Simply put your argument doesn't hold up.