I don't have a comprehensive test suite for seeing how search engines perform but I use some random programming terms to see how well it avoids SEO/AdWords boosted content.

Searched for radix sort -

Mojeek:

1. Wikipedia (as it should be)

2,3. Stackexchange implementation specific questions

rest: quality blogs, pure text tutorials

Google:

1. GeeksForGeeks

2. Wikipedia (seriously?)

3-10. all "blogs" that churn out the same content as geeksforgeeks (progamiz, javatpoint, tutorialspoint, etc)

DDG: Nearly an identical copy to Google's result

Personally, I'd prefer Mojeek to the Google/DDG results any day.

Will keep trying with complex queries, errors to have a better idea of how it performs, but still great work!