Not at all. I was checking my Melee records the other day and i found out that because i learned, before the game came out in the UK, how to unlock all the characters, that i ended up unlocking something like 6 in a day, followed by even more the following day!
When the game comes out in Japan, although i'm gonna dislike leaving the forums, i'm going to do so so that nothing is spoiled for me. The only source of info i'll use is the Dojo, because even though i may know who some of the secret characters are (or maybe not, it depends how Sakurai updates once the game is out) i won't know how to get them, and it'll be awesome to stumble upon them while playing.