Speak for yourself. In my opinion, this is a massive win for storytelling. And I'm saying this as a lifelong Star Trek fan who has watched every single series end-to-end except for TOS.
As much as I love it, Star Trek feels old. And this is the #1 reason why. With relatively small exceptions, every episode is complete disconnected from every other. The beginning of the episode sets up some sort of problem or danger. By the end of the episode, this danger is dealt with, gone. Character development is either non-existent, or happens at such a painfully slow pace that it's difficult to feel connected to what's going on. Instead what we see (if anything) are "snapshots" into the character's mental state. This is simply not how you tell a good story! So it's not surprising to me that Star Trek went fallow for a long time.
The point about character development applies to the universe too. People like to say that the Federation feels old. But what they really mean, in my opinion, is that the Federation should be viewed as a character. And if you think about it that way, it becomes obvious that as a character, the Federation is completely missing character development. So it's no wonder people get tired of it! Would you want to read a novel about a character who doesn't change at all during the course of the story? Would you come back for more after a half dozen of these?
The problem with saving the world perfectly every time is that over the long term, this means there is no change. Every individual episode might be a great story, but at the end of the day, did any of it matter? If there are no permanent consequences, it's hard to see how. This becomes especially obvious if you binge-watch the shows. Everything is always the same. Nothing changes.
What I want to see in a show (Star Trek or otherwise) is change. Permanent, irrevocable change. You dropped a glass, and it shattered, and no amount of wishing otherwise will put it back together again. That doesn't mean you can't do something about it! But certainly, you're not just going to put things back into exactly the same state they were before.
P.S.
You might be tempted to say, "oh, but what about DS9?" But even there, the format was largely unchanged. Go and count the episodes. The ones that actually dealt with any sort of ongoing story are a minority. Most of the shows follow the same framework as previous series. Except for one 10-episode sequence at the very end, you can basically forget that the war exists between the episodes that they mention it.