It's a rite of passage for all web-serial authors to get their first crummy rating. All you can really do is take it on the chin and press forward. Sorry to hear that the scourge of bad ratings hit you just now.
It's impossible to please everyone. There will be people who love your stuff and people who wanted it to be something else. The most important is to not give up and just keep going and more of those loving ones will show up here a cookie to cheer you up