i absolutely abhor talon - he and akali singlehandedly keep assassins (as a class) from having cool or unique itemization/systems support imo. Every time we'd want to make items or changes for Zed or Katarina, unless they're champion specific the Point-Click Wonders will use and abuse them harder than their companions with better interactive gameplay.
generally speaking though, Talon's huge issue isn't -just- his ridiculous snowball with 'you're silenced, i'm invis, you're dead' - it's that he's far more of an AoE burst-mage than a single-target assassin. Talon unloads a pretty crazy AD ratio all of the face of your team. I think he used to be pretty fun to play, but that was at a time when i wasn't very good at the game and i thought it took skill to one-shot dudes with insane AD scaling. Being a designbro has certainly turned me off to champs like him (and wukong, as if i needed any help on that front) D:
anyways, all of these are just my opinions. Also worth noting that for the last couple months and for a few more at least i haven't been working on ze balance or reworks or anything! Vel'Koz was the last champion i helped out with, and since then i've been working on the update to Summoner's Rift (along with a really talented team of artists and other folk) so all of my comments on balance, while perhaps informed, aren't necessarily relevant to what will be. I chime in from time to time and help in discussions, but i'm pretty heavily in map-land as we speak!