Anyone who thinks anything is cheap in video games seriously has to reconsider the way they play and stop being fucking children about it.
Of course there exists cheap tactics, the matter just is that who you play with. In competitive scene pretty much anything goes, while if you play with your friends to have a blast I doubt that the others enjoy if you use so called cheap tactics for the sole purpose of winning. And I don't think C-stick should be considered a cheap tactic as it's available to everyone and if you play without the C-stick regularly you can smash just as fast as with the C-stick.
Anyway, I've also noticed that a lot of times the C-stick that just doesn't work in SSBB. First I thought my controller was broken, but then my friend noticed it too. And then I read that people are experiencing the same thing here. Must be a glitch in the game or something. It's fucking annoying when you're just about to finish your opponent off with a quick smash, it won't come out even if you tilt the c-stick! Because of this I should probably get more used to doing the smashes the "regular way", even the quick, uncharged ones.