If any of you guys are legitimately upset about 3rd party characters getting into Smash, the one thing that I will say helped open me up to them was playing a ton of different series.
For some people it’s simply not possible, but after getting through Brawl and really loving how Snake played, I bought a PS3 and played MGS4, then got Twin Snakes on GameCube, then got the MGS Collection. Fell in love with the character and the series.
After that, I explored numerous other game series. The reason my main 3rd party hope (I’m pretty well off in terms of the roster as it is) is Lloyd Irving, and I really like Lloyd, after finally tracking down a used copy of Tales of Symphonia, was because the game just had a pretty cool story, memorable characters, solid voice acting...and that was just a few years ago. I highly recommend it.
Meanwhile, I come onto Smash forums and some avoid great 3rd party characters and series like the plague, and I simply don’t get it. There are some simply brilliant 3rd party games out there that you really should try if you have the opportunity. That’s how I branched out and have thus broadened my prospect pool. It’s worth it imo.