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Seeing, "Zuko is canonically bad at firebending," takes on my dash, so...

Zuko is canonically not bad at firebending. He may not be the natural prodigy that Azula or Iroh are, but skills don't work on a basis of either "extreme prodigy" or "not good at all."

Zuko works hard throughout the series to grow and improve in his firebending, and he does.

He defeats Zhao, an adult firebending master, in an Agni Kai when he's 16 and ostensibly still stuck on the basics, because mastering the fundamentals is a huge part of getting "good" at any skill.

He learns lightning redirection in about a day and later successfully uses it against Ozai, who is meant to be an extremely powerful firebender.

He learns to understand and appreciate his fire on a fundamental level from the dragons, who were the original firebenders, and in so doing he becomes a firebending master just as much as Katara (who had a few days/weeks at most of formal training) or Toph (who declared herself an earthbending master after learning from badgermoles) are masters of their elements.

And then he took everything he had learned about fire and put it together to help Aang master firebending over the course of a few weeks.

None of that says, "canonically bad firebender." It says that Zuko didn't start out as a major natural prodigy like his sister, but he worked hard, never stopped learning and growing, and developed into a very strong and capable firebending master in his own right by the end of the show.