As a long time Talon player and have played a lot of games with the new rework doing really well, and also not so well: He definitely has better tools than before and the main focus is his potential damage.
He get's kited out harder than other assassins because of how situational his E is. So if they see you coming you're going to have a harder time jumping on a target than say a Zed or Kat on top of losing damage from not being able to meelee Q.
Even with that I think that isn't his main problem. That's just one of the counter-plays to Talon which is fine. I think his damage needs a bit of tweaking more than anything else.
Particularly in his ultimate. They kinda killed his ultimate damage in order to cap his AOE and put more focus on single-target assassinations. That's okay, but aside from the blade converging (which is more of a quality of life change), the damage wasn't compensated enough for the base nerfs.
Often times I find the bulk of my damage coming from Q and passive. Which is also fine, but considering they out-damage my ULTIMATE, it just overall feels bad. An ultimate is supposed to feel like an ultimate. My trump card. But my trump card feels more like a meelee Q + passive proc. If my target even has 1 armor item, no matter how much lethality I have, my ultimate is going to feel like a paper cut.
------**When I take the risk to de-stealth and put myself in the enemy's focus, I should be rewarded with extra damage for making my blades converge. **--------
So many times was I fed and made my ultimate converge for the finishing kill, only to have them walk away with ~50HP because it does so little. I find myself using my ultimate more for defensive purposes or repositioning so my other abilities can do the damage.
TL;DR - Too much damage was focused into his passive that they made his ultimate into more of a utility tool. They should just add a bit of base or higher AD ratio, even if it's just a little, to help him out. This is mainly for the late game as he still falls off a bit, although not has hard as old talon.
For god's sake Rengar can build tank and get 30% free ad for just killing 5 people, give Talon a little extra damage back (not early game). On that same topic, please fix Rengar. I thought Riot learned from Bruiser Fizz and Tank Ekko....