C6 Bennet is good on some teams, and bad on other teams, such is the nature of team building - not every character is going to be the one-size-fits-all, they need to play off each other instead of just being a one-man wrecking team, so learning how to build the team to your playstyle is part of the game
that being said, the game is designed so that teams made of characters given to the player for free are able to clear all content, so have a bit of fun with team building instead of chasing the meta
Also, sponsorship tanking speedrun any% IKZ