Okay
  Print

I receive a 404 error after I create my minisite and post my first article/review.

This sometimes happens after you have created a new minisite and will only happen once and is easily fixable. Just go to Settings >> Permalinks and click Save. That will refresh your permalink structure and cause your reviews to work correctly. Any time you ever experience 404s in WordPress, this is always a great first step and usually fixes the issue.