I admit i've only had mine for 2 days but they smell strongly of plastic, like a new shower curtain. i don't remember my original Crocs smelling at all when i got them several years ago.  But...maybe it will fade...they do look good and are comfortable.
******now i've had them for about 5 weeks...the smell has mostly (but not completely) subsided but they feel slimy with wet feet...not at all like my original Crocs...it's just not the same great material no matter what they say....not recommended.