User blog comment:ArbyMcSwagger/(Minor Passive Rework) Twitch, the Plague Rat/@comment-10958553-20150311054047/@comment-1330314-20150311055916

With passive 1:

At level 1, Twitch's base AD is ~49, so he'll deal a minimum of ~1.5 DPS per stack, up from his current 1, up to a total of ~7.4 DPS at maximum stacks, which is a straight buff. It takes 240 AD for passive 1 to surpass Twitch's current damage, which you'd easily be able to achieve with any normal build (e.g. +  + anything else, including runes and masteries). Overall, this would be a straight buff at pretty much all stages of the game.

Passive 2 only overtakes passive 1 at 300 bonus AD (i.e. 400+ total AD), so it's strictly inferior in power, but overtakes Twitch's current passive at 167 AD, so is still a buff.

While I'm on board with a change like this, I'm not sure if this is what needs right now. His main problem is his terrible laning phase, but in terms of gameplay he also has a lot of mechanics that aren't being addressed as well as they could be (e.g. stealth, AoE and burst on marksmen), which is why I think he's being held back. His burst capabilities are also in contradiction with his passive, which is geared towards increasing his DPS. He might need a few additional tweaks, and perhaps a lot less burst, in order to be allowed to have a stronger passive.