Pokemon fans love Charizard though. :D
Anyways, typing is just one characteristic of a Pokemon. When looking at a good competitive Pokemon, you take all things into consideration. Look at Volcarona, an OU Pokemon because it is in a solid speed tier, has nice offenses, a decent movepool, and access to Quiver Dance. Ho-oh in Uber because of stats, ability, and movepool. Non-Mega Charizard just doesn't have the stats or the movepool to really pull off any sweeps, and when you compound that with poor typing, that's when you have a problem. Granted, Charizard is still a beast in NU.
What Talonflame has is access to priority Flying type attacks. This means priority Roost, Acrobatics, and Brave Bird. Acrobatics and Brave Bird have high base power, and after a Swords Dance, Talonflame can deal a lot of damage. It's fairly difficult to stop actually. This trait alone makes Talonflame worthy of some consideration, although when everything dies down, it's probably going to be a safe bet that Talonflame ends up in RU.