Talonflame doesn't have good damage. 81 attack is nothing. To put it into perspective, unboosted Talonflame (adamant) literally has less than half of the attack of a banded Tyranitar.
Fire/Flying is also a really crappy typing. No pokemon with 4x to rocks can be considered to have a good typing. Plus, its fire typing can easily be exploited by the bulky water archetype, leading it to be beat by Milotic/Slowbro/Suicune (especially Slowbro)
Gale wings is the only thing that saves Talon, and due to its numerous other exploitable weaknesses, I'd argue that Talonflame is very good as a pokemon, but not bannable.
This!