Talon's auto attack animation
Is incredibly slow, can it be bumped up to be on par with other assassins (i.e. Zed)?
Especially considering an auto attack at three stacks is roughly 40% of his combo damage, it's insanely hard to assassinate the majority of targets in the current meta. In most cases, someone with suitable reaction speeds can stealth or mobility out of his auto range while he's in the animation.
Which is why he's starting to build Stormblade, even though it has little to no synergy with his kit, because the attack speed makes it harder for the enemy to interrupt it.