I really hope your first instinct isn't to post fake negative reviews, it won't work out well.

You have a few options:

1) Just keep doing what you are doing the best you can do and stop using a measuring stick against copy-cats. Don't get into a feature-creep war.

2) Focus on your existing users and work hard to retain them and use them to generate more growth. Get them to talk about your product positively.

3) Find out how those people are getting users instead of you and try to replicate that.

Competition is a good thing, it means there is a need. Your feature set is only a small part of what users want, so make sure you are nailing other areas like support and satisfaction.