Shakespeare
Historically William Shakespeare stuff was referred to by Christopher Marlowe as "of base intelligence hardly befitting the stage." Now he's one of the greatest writers ever.
J. R. R. Tolkien had his stuff praised but largely ignored for a decade until Return of the King came out. From there on he was the master everyone looked at. Now he's one of the greatest fantasy writers ever.
Richard Bauchman. Who? Exactly. Had to change his name to Stephen King. Did poorly for Carrie and was criticized for its structure. Now he's still criticized but when he criticizes people they pay attention.
If you think you're writing sucks then first ask yourself why? By answering that question you can address the problem you have with it. I routinely think my writing sucks because it fails to be as visual as I want it to be. I'm not trying to make my writing some work of art. I have an idea, I present it, and then let the reader rate it. I use my time to waste on sequels, other stories, and hunting down an agent and / or publisher than seeing what the best word for this sentence is so that 150 years from now some stuffy old English teacher can say I was a master.
Never ever cut something because someone else told you to. The moment you sell out to others is when you start selling out your ideas and your soul. Edit stuff sure. Change words to make it flow better okay. But don't you ever cut it. You wrote it so stick by it. Edit it but don't toss it.
That being said, don't you ever write something unless you mean it. I'm sure I could be paid to write some movie script at the drop of a hat. But unless I mean it, e.g. I like the storyline, I won't do it. Even if I'm broke and need the money I place a value on anything I write to that extreme and won't write something if it disagrees with me.
Which is probably why I'm an unpublished noob that most people nod to and ignore.

But just like George Burns said, "I rather be poor doing something I love than rich doing something I hate."