Everyone uses GCN controller. And instead of watching matches, spend that time playing more instead. What you need to learn to do is to identify what you did wrong in between death stocks, while waiting on that safe little invincibility platform. Watching videos will just tell you "Oh I could've done that there instead". And that's not good, why? Because that's very situational. Is there really going to be a match where there's going to be a specific point in which everything that happened is exactly the same as in a video you have? Not in brawl no. So it's even more important to just play alot.
Videos should really only be taken for the purpose of an eventual combo video, or if it is the finals of a tournament, which are usually intense as ****, infact, I support crowd videos instead of the usual taping of a match using a VCR.