No at all.
You may also want to read the following part, from YC FAQ page.
Why didn't you accept our application?
Strange as it may sound, the better your application was, the less likely there is to be an answer to this question. So don't take it personally. The fact is, even the best investors are quite bad at picking winners. VC firms consider themselves to be doing well if 4 out of 10 companies they fund succeed.