Oh hey
I wrote something about this earlier when someone asked me why (his) Marth was hit/miss.
Copy/pasting:
Like, Marth is a good character, a REALLY good character- in design. In practice though, he's pretty meh.
He has the tools to cover every option that every character in the game can throw at him. The problem is, you're guessing non-stop. He has the capacity to do everything, but it all is contingent on your ability to guess right. And when he messes up.. well, he dies.
DDD is fat and lives forever so he has a chance to just live and live until he gets a gimp. Snake sets up camp, punishes to a disproportionate level compared to frame data/range, and is fat. Diddy has bananas, Falco has lasers/sideB/jab.
Marth has "guess well"
That being said, the reward that Marth gets off of every single correct guess could end a stock really efficiently. Marth carries momentum incredibly well, can force defensive options (roll/SD/AD/etc) and punish them better than a very large part of the cast. His ledge trapping game is, imo, the best in the game. His ability to juggle is top 3 or 4. At high-mid %s, a good guess leads to a stock via fsmash. And so on and so forth.
The problem is, it all comes down to a guess; if you guess right you look like Ramin in "Messiah." It carries through, it was the right decision, everyone thinks you're brilliant/amazing/etc.
If you guess wrong everyone goes "wtf, that was a terrible option and he got punished for it so badly."
Marth is basically just **** or get *****, off of guesses. Luckily, and the reason that he isn't lower on the tier list, when Marth guesses wrong, if he catches himself, he has the tools to regain his safety (slow fall nair, a really good Broll, DS, etc) to reset the situation back to neutral. But still, it all comes down to a guess, and how quickly you can recognize that your guess was wrong. As a result, every Marth ever will always be hit/miss.
Don't get me wrong, I love Marth. And he's is a GREAT character. The reward that you get from a good guess is HUGE and it's so much fun. But yeah, still comes down to a guess xD