Nobody looks back at other gens top selling games and says "but it took years to get there". That was a pretty bad attempt at downplaying the monumental success I must say.
The fact splatoon sold over 2m makes this impressive. None of you even gave it a chance pre launch.
Well, no other home console generation in Japan had its winner struggle so hard, so "it took years to get there" wouldn't apply to any of them and therefore nobody would say it.
Your second paragraph is odd. It reads as if you are praising the Wii U and bashing the naysayers of Splatoon, but that doesn't make sense in the context of the other things you say.