tiersr4queers.
How would tier lists become law exactly? They just measure how good a character is based on how well they can go against other characters. Calm down, not like some supreme being will come down from the heavens and say: "Because of tier lists, everybody must now use Meta Knight." I bet I can stop losing The Game before something like that even happens. Tier lists haven't ruined the fun for me yet.
That's a good thing; tier lists AREN'T supposed to make anything less fun. They're just lists of how good a character is with respect to other characters.
That being said, Brett is absolutely right - some characters are inherently better than other characters. Whether you believe in a tier list or not, you simply cannot deny that each character has different/more options compared to other characters. In any fighting game, options are essential (which is why I don't really like Brawl's game mechanics... they give too many options to the defender, but that's a whole other issue). CF is much worse than MK because of his lack of options - for example, if an opponent is coming back to FD from above the edge (and assuming they don't go for the edge, either), they can either (1) attack, (2) airdodge on the way down, (3) not do anything at all and just land. CF can jump up and UAir to cover options 1 and 3, but it's not fast enough to cover option 2. Similarly, jumping and baiting an airdodge will certainly cover option 2, but not options 1 or 3. His best option is to wait out on the ground to rush in during landing lag, which is less than 5 frames of vulnerability if they chose options 2 or 3. MK, on the other hand, can either use Tornado or UAir to cover all 3 options, since the Tornado sticks out long enough to catch airdodges and UAir ends quickly enough that he can either UAir again or DAir if the opponent is below him. MK is such a terrific (and as some would say, ban-worthy) character because he shuts down as many options as he has for himself. Falcon will never be able to cover so many options nor will he be able to have as many, and the same is true for Ike.
tl;dr - Some characters are better than others. Tier lists exist, but no one is forcing you to "conform" to them unless you're playing in a Low Tier tournament.