In reality Stoker is essentially a mixture of several mercs Fragger with the M4 plus high health 120, I know Fraggers health is higher obviously. You have Kira with the Ammo station which really separates Stoker from other mercs and you have something akin to Kira’s lazer in his molotov which yes can be used as a free 10 seconds on a bomb plant which can be extremely useful. However, I feel that Stoker would be amazing on maps like underground especially on defence considering before this patch you wouldn’t have access to ammo because nobody ran Kira or Skyhammer, but now that there is an ammo crate he’s kind of null for that aspect. I do think what you should be saying is does Stoker replace Nader? My answer to that is Yes and No, I feel that they both bring different perks to the table due to their weapon choices, but I feel that they will both flourish on different maps.
Edit: Forgot to mention Fragger is quite a bit weaker right now in my opinion due to the explosive nerfs the decrease to 32cm from 64cm makes a huge impact in the fact that you have to literally throw nades at people’s feet to even kill them. I was throwing spawn nades on Bridge down the alley from Generator and before the patch I would get 1-2 kills a nade and now I only got 1 kill the entire time on that part…