Speaking as a two-time NaNoWriMo winner myself (2009: Not Taking This Seriously, 2010: Kevin Levitin and the Special Snowflake Syndrome), I don’t consider it an impressive credential. Writing something good during NaNoWriMo is impressive, but merely generating the 50,000 words is not difficult as long as you keep a sufficiently low quality standard.
Speaking as a two-time NaNoWriMo winner myself (2009: Not Taking This Seriously, 2010: Kevin Levitin and the Special Snowflake Syndrome), I don’t consider it an impressive credential. Writing something good during NaNoWriMo is impressive, but merely generating the 50,000 words is not difficult as long as you keep a sufficiently low quality standard.