I just don't understand like, even if you don't care for the themes or foreshadowing or exploring Walt's character, the premise of the episode is just fun in a really unhinged way. Jesse thinking Walt has legit gone insane because Walt is building a giant flyswatter and falling off the railing, so he's drugging Walt's coffee etc. all of Bryan Cranston's experience as an actor is on display.
It's not the lowest rated because one has to be, people specifically pick on it for being a bottle episode and I often hear "doesn't move the plot forward" thrown around. Yet it's extremely important, genuinely critical, to understand Walt's development and his acclimation to his life after Skyler learns his secret.
https://imgur.com/gallery/dXDmJHw
https://www.youtube.com/watch?v=75GL-BYZFfY