The biggest injustice, IMO, is the omission of Harold Jackson, who was one of the top 2-3 WRs of the decade of the 1970s. But many of the voters now didn't see him play and compare his numbers to a guy like Andre Reed, who IS in. A completely different game with different rules. Jackson was better relative to his peers than Reed was. Not meant as a slight on Reed but receiving numbers are so much pumped up now due to the rule changes over the years.
I may attend the induction ceremony this year. As a lifelong Bear fan, great to see McMichael and Hester get in (Sorry FW, but Kane is right re: Hester). And people forget Peppers was a Bear for a few years. I also used to attend one Colts game a year during much of the Freeney (i.e. Manning) era. Freeney was an amazing pass rusher.