Is it just me of this story has turned really bad for quite some time now?
It is not even some bad with a bit of good, it is terrible...
It feels like it lost direction and is floundering. The author wanted to introduce new threats (attackers from another world) and clearly intends to develop them into the main threat but isn't doing so gracefully. They needed to have otherworld Vegeta pop out of the sky and plant 5 saibamen and kick everyone's ass but instead we've got those two dinguses that are already dead after showing up like twice. Too many different plot threads are occurring simultaneously and they're entangled rather than woven together. Showing Motoyasu losing his mind is fun and all, but there's no primary villain for the party to overcome with his newfound power especially now that the two goobers are gone. There's a passive threat of "the next wave" which makes this whole section feel like wasting time instead of progressing towards a concrete goal. They need to "Get stronger" but there's no clear "how much stronger" and "by what point." This should be a training arc where they need to hit level X before the dark tournament starts, but instead it's just kinda meandering without a clear threat or goal.
I don't think it's manga-ruining, just a weak arc.
Then again, I said that about every arc after All-Might lost his powers and we all saw how that turned out.

Either way I'm going to stick around because Motoyasu is fucking hilarious.