James Gasik
We don't talk about Pun-Pun
No it's cool, I realize that in most cases, it seems as if you have to be trying to make a bad character, but sometimes things that sound cool to people just aren't until they get some system mastery under their belt. Like Berserkers, arguably Assassins (can be cool, some players struggle with them), and my personal pet peeve, Wild Magic Sorcerers. I played one thinking it would be hilarious. Most of the time I felt like my class features (which were only useful some of the time) were locked behind a wall of me having to constantly ask the DM if I can have Tides of Chaos refreshed.But the bar is incredibly low. Like if you have 14 in your main stat you're set. This was in the context of ASIs, so I interpreted it as the players not floating the ASIs to their main stat being an issue. Sorry if that wasn't what you meant. (And it seems it wasn't.)
And even those examples are fine, but you could totally get a guy who decides to play a non-variant Human 15 Dex Fighter in Medium Armor who uses a shield and a rapier, goes Champion, and then decides at level 4 to multiclass into something random like Bard. Even in this example the character would probably be alright if the DM softballed the enemies, but it's rare that the entire group is built this way.
So our poor hypothetical Fighter could find himself in a party with a Variant Human Oath of Vengeance Paladin with 16 Strength and Heavy Armor Mastery who takes less damage, deals more damage, and has an endless array of cool-sounding special features and wonder what he's doing wrong.