Yes. However, at these moments I apply my (almost)-never-failing NaNo technique called "Blissful Denial". If that does not work, I use my even-more-rarely-failing writing method of Writing Anyway.

And hey, if it makes you feel better (and even if it does not), the first sentence of your post said exactly what I was feeling, except you phrased it better than I could. So, if you could phrase that thought well... maybe your writing doesn't suck as much as you think....