These apps were likely picked because MR receives a cut of sales. For example, it is odd that Weather Atlas made it onto this list given that it is ranked #108 among weather apps, and only provides weather for the US. Feature-wise it's not even close to apps such as Weather Bug, Weather Channel, to name a few.
If one was to review weather apps and pick the best one, Weather Atlas wouldn't even make into the top 10.
If that is indeed the case, MR should disclose up front that it is receiving payment when someone purchases one of these apps.