To be honest, those Smash fans that hate SmashBoards don't know what they're missing. Even if you don't like competitive Brawl, the community there is still a very good and informative one. There's no doubt in my mind that the taste for competitive Smash will grow on people if they go there often. It's fun to discover a new way to play your favorite game, if you never experienced it before that is. I experienced it myself without even knowing Smash sites existed on the Interwebs (since the N64, hehe!), but it seems like SmashBoards were always a bit more advanced in strategies and new ways to play than I was. I guess that's because there are a bunch of talented, willing to help members there that want to get the most out of those games! They make amazing guides for each individual characters that can help you perfect your play style every time. That's awesome if you want my opinion. You don't have to copy the strategies they list or show with the help of videos, but knowing simple stuff such as Snake's hitboxes on his tilt moves is always interesting! ;)
Also, I didn't see anyone there enforce their logic of the game anywhere, so I don't really know what you're talking about here. If you're talking about Brawl+, well, those guys are dedicated about making the experience a better one, but they're definitely not forcing you to play their style of game. SmashBoards seems to be more like a resource for information about the various Smash games. I'm not sure if they created the SmashWiki, but that's one good page if they did!
Oh, by the way, I'm kind of new there, so I guess you can call me a "new guy" for now. I never used to visit the site until now. =P