This line really says it all:
"Something more than half of what Felix Sturm totaled in terms of title defenses"
If Gatti gets in because he was fun to watch and popular in the USA, you could make the case for guys like Sturm or Chris John because they are popular in their own countries and people there love to watch them.
The best way to determine entry to the hall is by measurable achievements. Guys like Gatti, Emanuel Augustus and Mickey Ward should certainly be celebrated, but not in the Hall of Fame IMHO.