Recommendations from Software Center are just odd (or for default and installed apps)
Solution 1:
The pieces that conform the Recommendations feature can be viewed in the blue print registered to track its development in the 12.04 cycle. In a nutshell, it’s a server-side recommendations algorithm (Launchpad project) that sends data to the Software Center so it can display apps that you’re likely to give a good rating.
This feature is specificated in detail here. Unfortunately, the specification is not fully implemented in Software Center. You can help by filing bug reports on every issue you may find, against the software-center package.