While I agree with this, I also think that it's interesting to hear about this stuff. I recently held a round-robin with some friends from school and they were all determined that Roy was the best. By the end of the night they all thought falcon was the best because of the advanced stuff I could do. Basically, I just like to hear what people think of the game before they live under the tyranny of space animals.
It's clearly practical that people are just, dare I say, try-hards at the game when using the Spacies or top tiers, clearly exploiting their strengths moreover than the other characters. People put more time to "learn" about the top tiers and much less time to try and learn about the low tiered characters. Even with the advanced stuff you could do, there's still a lot to learn about the characters overall, especially some of the low-tiered, harder to learn characters like Link, Roy and others. So practically, the tier list has no true meaning until everything is found out.
Now off of that topic, a tier list should be comprised of votes of multiple competitive smashers in the large majority instead of the small minority that most tier lists have; based upon that resulting factor, it would make a more accurate tier list because we get community voting rather than a minority vote; as well, it would be considered a "Community Tier List" more than the other one. Of course, a real community tier list would be moreover a casual players tier list instead of competitive player tier list. Why no one's stepped forward to ask for a Casual Tier List is beyond me.
If one were to make a tier list, like you are trying to make, you'd have to first, gather all of your friends and set your favorite/main characters aside, then have each person make their list and competitive chart with the characters against others, and finally calculate all of the results into an average, which should be easy at first, but will take a rather strenuous amount of time. Setting aside your mains would result for a more accurate resulting, since it would not have a bias behind it (something that the regular tier list kind of does).