Well, you've reduced the risk of someone MITMing your users connections. So now your risk is of someone MITMing CloudFlare's connection.
My impression is that this will rule out most coffee shop owners from tampering with the connection through their router. Even if state actors can still get at your content, this is still better than "no SSL whatsoever".
Honestly, though, for anything beyond "static HTML on some server somewhere", basic SSL conf. is a 30 minute one-time job...