FrogReaver
The most respectful and polite poster ever
"Better" is a nebulous term: better at DPR, mostly, but so what? Doesn't mean it is"over"-powered if an option is powerful.
Better is a term that can be used. OP is the best term. It conveys the most information. I could have a max wisdom rogue with expertise in animal handling but no one would be saying he's OP even though he's better at animal handling. Like it or not, D&D is a game where damage matters. It is not everything but it matters in almost any kind of playstyle. If something does way more damage than other "damage dealing classes" in a game where killing enemies makes up 25% or more of the game then that something will get called OP.
Lore bards are OP as well (because the are soo good at social interaction). Probably more OP than the battlemaster SS CE fighter but in a different way. That said, in most campaigns social interaction scenarios don't equate to death like being bad at combat can and that's why you see OP usually related to combat and not other things.