I got bored of this game until me and my friends learned the advanced stuff. We've been playing consistently for 3 years since then. Seriously, to us, the competitive part of the game is what makes it interesting. If that stuff wasn't there, it would just be another party game that's kinda fun for a half hour. Competitive fighters are where the fun's at for me.
Oh, and Clockwork, I'm really curious to know what area it is that you were doing all this in, because most competitive Smashers don't praise Ken, and Wavedashing isn't cheap. In fact, most competitive Smashers will tell you that Ken is a jerk in person, and that Wavedashing is one of the least useful advanced techniques. SHFFLs and chainthrows are 100 times more useful than wavedashing will ever be, and for wavedashing to be useful at all, you need to be able to do it without thinking about it, otherwise it will actually make you worse.
About DBR, some of their combos are assisted, as in the victim purposefully didn't escape when they could have. Their videos are just to kind of show potential. Some of the DBR guys will tell you themselves that they aren't that good(except for GERM, who is not a very pleasant person).