What's with all the hate for the N64 controller? Granted, I haven't played it in at least 7 years, but I remember loving it's design... Anyway, I thought SSB64 was easy because:
I thought the question marks on the character select screen were just fillers.
My friend told me that Yoshi was broken and, following that ignorant bliss, I owned Master Hand multiple times (yes, I got Jigglypuff, but I was to ignorant to think the other question marks were actual characters

)
I didn't know there was a 2 Player mode. Me and my brother tried to find out how to fight eachother on single player mode for FOREVERR.
And I just thought the characters were easy, since I... played everyone on easy.
IMO, though, Melee was the hardest in terms of getting all the characters - I spent hours trying to find out how to get up the long box thing in Young Link's target test without wall jumping - SHUT UP I WAS YOUNG.