Can you judge the quality of your own work?

Sometimes I think writers know in their guts when they've written something great. Sometimes I meet writers who are too modest about how great their work is. Sometimes I look back at work I thought was good when I first started out, and I realize it ... wasn't. Sometimes I look back at a story I wrote years ago and didn't think much of back then, but now I realize it has really held up.

Do you know how good your writing is?