Funny thing is Voltron is actually way more popular than it's Japanese original, Golion which didn't do great in Japan.
It's something that occasionally happens (and might influence a continuation of the anime or American co-funding; such as Space Dandy, Big O etc.).
Some comedic anime like Nichojo didn't do great in Japan either but did well in the US.
Streets of Fire is kind of a reverse thing, it was a flop in America but did well in Japan and influenced Bubblegum Crisis, Megazone etc.