Former WWE superstar JBL named his top five most underrated big men ever in wrestling (excluding “giants”):
2. Kane
3. Stan Hansen
4. Bruiser Brody
5. A tie between Vader and Mark Henry
He gave honorable mention nods to Otto Wanz, Don Leo Jonathan, Yokozuna and Kevin Nash
(source: Something to Wrestle)

Does JBL not know what the word ‘underrated’ means?
@art123guy
Yeah, this is exactly what I was gonna say. The podcast is great, but their top 5s suck. As lists, that is, the stories he tells when they discuss them are still awesome.
@Art
I think he has a different version of what it means than the rest of us. I think of underrated big men, first name that pops in my head is the late John Tenta. Haystacks Calhoun. I’m sure there are a few others, but their names escape me right now.