I'm working on yet another draft of the never ending book. I was telling a writer friend this and they sympathetically asked what the problem was. 'The writing,' I said cheerily. 'It's not good enough.'
They were taken aback by this - they'd assumed I was going to say something like, there's a plot problem in the middle. Something specific, rather than a general 'not good enough'. But that's the truth - it's not good enough (yet).
I read once that Richard Curtis's script editor wife reads through his draft scripts writing NFE in the margin. NFE stands for Not Funny Enough. He re-wrote until there were no NFEs.
If I let something I'm not proud of go through it might get published but I will know it fell below my standards. And readers will know it falls below my standards because they're not stupid, and word of mouth will be not so good. Then fewer people will buy the next book.
And yes, when you read about the sales that 50 Shades of Grey is getting, despite the clunky writing, it is tempting to cut corners. But I would know. And readers will know. So I'll just have to carry on re-writing until it's good enough.