The only bad episode in the first season was Vatos, but season 2 is just riddled with horrible character development and terrible writing. They took a good show with amazing potential and turned into a 'daytime drama' with no focus on any characters. There is absolutely no development on Carl nor Glen, both of whom were complete badasses and deep development in the comics.
Even the writers forget their own story. We need water, let's forget the big truck with gallons and gallons of water and go find some in a well with a zombie.
Awful editing as well. They kept showing the group pulling up rope, making progress, and then we cut back to Glenn and he's still in the exact same position, almost in reach of the zombie.
You could consider these filler episodes, but come on now, try harder please.