I just feel like newer writers tend to be over-corrected to make their writing formally correct. But unless we do, we're not going to get published.
Weelll, that's not necessarily true. There's a difference between something that legitimately needs work and just following the rules because they're rules and the writer fears he won't get published if he don't. You always have to think of what's best for the story and what you intend for the story.
To give you an idea of how destructive not paying attention to yourself can be: I used to have a cowriter a few years back. He was a marketer, so he had some of his own rules. He wanted the story to be marketable, so he was always questioning, "Will the women readers like this?" Enter The Critique. He found a friend who was a published romance writer and asked her to do a critique of our Thriller, which was set during the Civil War. She got to page 70, wrote four pages of comments, and sent it back. I read them and knew instantly that she had hated--utterly hated--the book. Instead of saying, "This isn't for me" and passing on it, she tried to justify why she didn't like the book by nitpicking it to death.
We just set it aside and forgot about until a few months later. Cowriter discovers that romance writer is vehemently anti-gun. The book was set in the middle of the Civil War. It was pretty hard to avoid guns! The place where she had stopped had involved the hero pulling a gun on someone else.
We finish the book and start submitting it to agents. We get one full request right away and the usual bunch of rejections. Cowriter is convinced that if we didn't sell it in the five submissions, we didn't do the book right. So he starts looking for things wrong. Things that are making it not marketable. And he goes back to that nasty critique and decides that having guns in the book must be the issue because she was offended by them. He wants to do a rewrite to remove the guns from an action-adventure thriller. From a book set in the Civil War, which was his idea for a setting. And he was a historical firearms expert who carefully picked all of the guns in the story.
And granted, there was a reason the agents were likely rejecting the story. I've had a huge problem developing subplots--I start them, then forget they are there and never develop them further. I believe there was close to 30 of them in the story like that. It shows up as a structural issue. Our critique group went over that entire book, and not one of them even noticed that problem. Guess who found it? Me, the writer, while I was doing a synopsis for a different project.
Critiquers can be an invaluable tool, but they cannot be relied on to tell you what you need to fix. As the writer of the story, you are the only one who gets that call.