regarding Isaac Bruce:
I don't ever recall him being such a dominant player that I considered him to be Hall of Fame worthy during his playing days. Hall of very good, but not HoF.
Yes, his total career stats and rankings are outstanding. But NFL football is constantly changing in a manner that benefits quarterbacks and receivers in terms of their all-time rankings.
I have said before that to me the best way to compare stats of players who played in different eras is to compare how they ranked each year to their peers, rather than to look at their raw final career statistics.
Consider this with Isaac Bruce:
# of seasons ranked in the top ten in Receptions: 2
4th in '95, 8th in '04.
# of seasons ranked in top ten in Touchdowns: 2
10th in '95, 7th in '99.
# of seasons ranked in top ten in Receiving Yards: 4
2nd in '95, 1st in '96, 3rd in '00, 5th in '04.
# of seasons ranked in top ten in Receiving TD: 3
6th in '95, 2nd in '99, 6th in '00.
# of seasons ranked in top ten in Yards per Catch: 2
7th in '00, 2nd in '01.
# of seasons ranked in top 10 in Yards from Scrimmage: 2
4th in '95, 10th in '96.
That's it for a fairly lenient metric, top ten. Fifth best receiver out of 16 teams in a conference makes it that high.
Narrow it down to top five in any given year, and Bruce makes the list only eight times in six different categories.
He'll probably get in because he ranks 5th with 15,208 yards, played with Kurt Warner, and ranked second at the time he retired. But that number is meaningless in the context of the history of the NFL, the same way it was when Vinny Testaverde retired with the sixth most passing yards in NFL history.
As a point of reference, compare to Randy Moss:
Receiving Touchdowns: led NFL five times, 8x in top-4, 9x in top-6.
Receiving Yards: 2nd 3x, 7x in top-5, 8x in top-10.