Road Warriors
No one will ever come close to the impact they had. Ruthless in the ring, killer promos, and while they were heels in every territory they wrestled in, the crowds cheered for them no matter who they were wrestling. Throw these guys into the WWF in 1985 and put them against Hogan and Andre, Hogan and Andre get booed out of the building. Their buzz was that huge at the time. They were totally wasted in the AWA. Verne Gagne can be handed golden eggs and he'll think its a giant turd.
Nikita/Ivan/Krusher Kruschev
Most underrated team in history. Always wanted to see them reunite in some capacity but it never happened. No demand for it really after the Cold War was over, but should have happened anyways at some point. Actually preferred the Nikita/Kruschev team, but it didn't happen often because Nikita was mainly focusing on singles wrestling.
Midnight Express
Wanted to put Demolition on this list, but the MX cant be overlooked. So much talent but simply had zero skills on the mic, and this clearly affected their legacy. The feud with Tully and Arne had so much potential, but they bailed and went to WWF killing it prematurely.
honorable mentions:
Demolition
Ole and Arn Anderson
Barry Windham and Mike Rotunda
Tully and Arn
Hart Foundation(could have been amazing with someone other than Neidhart)