1. Unless you prefix URLs with http or https, you are relying on Opera and/or Google's algorithms to point you to the correct page. Some might say that's a feature, except...
2. You cannot see the URL of recommended pages before you select them or while you are browsing them.
3. There no indication whether you accessed a page via HTTP or HTTPS.
This browser teaches users to ignore security. It assumes that no one ever enters a typo, that Google's search results can never be gamed, and that any anti-phishing functionality they have included (one would hope) is fully up to date.
All the respect that I had for Opera as a company just vanished.