Hypno depends on the deck build, Jand, as you mentioned multiple times, your Durant deck works very differently to this one, and you can't apply how your deck works to every build (Not saying it's a bad build, I'm sure it's excellent, but it can't be applied to everything). That 1/4 chance success rate can buy you that single turn you need to beat your opponent, in those games where using hypno is viable (i.e. Trainer lock).
You guys are under the misconception that if you run a Pokemon in your deck, that it has to be played every game otherwise it's a useless card. I usually never play Drowzee down in the first goodness knows how many turns, until I see my opponent losing their resources by wasting them or by myself milling them. Of course I'm not going to play down a drowzee with a huge chance of catcher present. I only play it when I know my opponent's resources are slim, or I can definitely retreat it the next turn (i,e, Switch/Junk Arm for Switch).
Hypno has won me a lot of games, because my opponent assumes that when you catcher it, you win the game. The only time in which this is the case is early game (At which point I wouldn't dare bench a Drowzee) while they are setting up. Other than that how are they going to progress in the game without knocking it out if they're already set up? If they knock it out then it's fine as it is as you say "A gimmicky card" anyway.