I'm Android dev, and I think the "Want quick suggestions?" feature is a good addition to Google Play, because it encourages users to rate apps.

Yes, the average rating for my app has gone down since Google made this change. But rankings are relative, not absolute, and all apps are being treated equally, so it shouldn't make a difference in the rankings.

What wasn't mentioned is that the number of ratings has increased substantially. I get at least twice as many ratings as before.

In my opinion, more users giving ratings will result in more reliable rankings.