I wasnt alive in 78 (born in 81) so I dont know for sure but my understanding is that, at the time, Donner's Superman film was just as polarizing as Snyder's MoS, with lots of mixed reviews. Time and nostalgia has led us to look fondly at the movie but when it hit it had a lot of detractors. Whether the origin itself was part of that contention though, I can't say.
Really though, the Donner origin is almost identical to the Snyder one, as far as the plot goes (the execution and time spent on it differs greatly of course). Zod tries a coup and is imprisoned shortly before Krypton explodes....Clark's raised by the Kents and struggles to fit in with the other kids......Pa Kent dies......Clark leaves the farm.....eventually uncovers his heritage in far North and is given the costume by his holographic space dad.