Pat Benatar - Fine vocalist. Had a few good rock songs. Nothing special beyond that (though I have awfully fond memories of my dad and I jamming Heartbreaker back in the day).
Dave Matthews Band - They vacillated between a mediocre jam band and a mediocre pop band. I don't think they're HOF material.
Depeche Mode - A massively influential electronic band whose impact is still being felt in pop music today. Not a personal favorite, but they deserve to be in there.
The Doobie Brothers - Borderline band (leaning YES). I really enjoy them, but they very much feel "of their time" and I don't think they had much impact/influence on future rock.
Whitney Houston - Not a fan, but she deserves a spot. Her and Mariah Carey pretty much defined the modern concept of a vocal powerhouse diva.
Judas Priest - Should've been in long ago. One can make a case that, outside Sabbath, Zeppelin, and Purple, JP had the biggest impact on the future of hard rock and metal.
Kraftwerk - Absolutely deserves in. Again, not a huge fan, but they were to the 80s what Depeche Mode was to the 90s.
MC5 - Another borderline (leaning no). The problem with most punk bands is that their legacy is often dependent upon one album that tended to be more influential in concept than good in execution.
Motörhead - Also borderline (leaning yes). I love Motorhead, but they're somewhat to metal what AC/DC was to classic rock; dependable but samey.
Nine Inch Nails - Probably deserves in though, again, I'm not a fan. They were an awfully big force in the 90s.
The Notorious B.I.G. - I don't care for rap but his reputation is pretty unquestioned in the world of hip-hop.
Rufus featuring Chaka Khan - Not very familiar.
Todd Rundgren - I like what I've heard of Rundgren, but I'm not familiar enough to weigh in.
Soundgarden - Borderline (leaning no). Badmotorfinger and Superunknown were great albums, but I don't think either were generation-defining the way, say, Nirvana's Nevermind, Pearl Jam's Ten, or Alice In Chains's Dirt was.
T. Rex - Probably yes. They were one of the big figures in 70s glam rock.
Thin Lizzy - Very much yes. Tragically underrated and underappreciated for how versatile and consistently excellent they were. They're also one of the "secret" influences on metal given how much they pioneered the duel lead guitar sound.
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To sum up (my opinion):
Definitely yes: Depeche Mode, Whitney Houston, Judas Priest, Kraftwerk, Notorious B.I.G., Thin Lizzy
Probably eventually: Doobie Brothers, Motorhead, Nine Inch Nails, T. Rex
Probably not: Pat Benatar, DMB, MC5, Soundgarden
If I was actually making predictions, I feel like Depeche Mode, Whitney Houston, Kraftwerk, and B.I.G will make it, but I'm doubtful about the others.