I liked it before the timeskip, does that count?
The show had to inevitably suck huge cock though, the whole "plot" and everything was unsustainable. It wasn't really a story or anything just "Ima be the greatest and defeat the big boss" and then once the big boss was defeated they had to make up some lame ass reason why everyone was living underground and there was a big boss etc.
The truth is no such reason ever existed, but they felt obligated to make up some shit. And the result was shit, because it was a shitty show from the start.
Protip: If you ever decide to create an anime, draw out the plot from beginning to end before you start kk.