I reckon G1 Inferno is definitely an underrated character. He was one of my fav G1 toys back in the day and had a very cool gung-ho personality he had to reconsile with his Search & Rescue job. Also very underrated/underused in both the Dreamwave and IDW comics where he has really only served as crowd filler. I would have voted for him over Cosmos.

He is also on the top of my list for characters I would love to see an MP of