Well, a missing rubber washer or any other minor discrepancies won't make you feel upbeat for sure. BUT! Before you'd make yourself pissed of too much, put it in perspective. How would you feel about your $20K BMW when the final drive fails at 5K miles, the cruise control starts acting on its own at 6K, the oil level sensor gives it up at 12K, etc. ? How about the Honda Goldwing which has such a bad fuel delivery/ignition dead spot at 1800 rpm that it can easily throw you off balance at low speed maneuvering if you forget about it....and what about the experience when the front brake caliper got loose on my Yamaha V-Star at about 1500 miles?
Yes, RE has lots of room to improve CC in order to avoid minor pissers to be delivered to the customer but it is also your dealer's obligation to 'get the little corks out of the glass before served'. If pre delivery inspection (PDI) is done properly the dealer should notice a large missing rubber washer or similarly obvious flaws.
A RE might require a bit more attention from its owner than a Suzuki, but ride somewhere with your buddy on his Jap mass production and you'll see how much attention your bike will draw from the crowd.
The good news is that you can figure the minor issues with a little involvement in a short time and then, you can stay solely focused on the compliments you receive. Enjoy the continuous smile that ONLY a bike like a Royal Enfield can put on your face.