For some strange reason, people who don't enjoy the game band together on iTunes a lot more than people who do enjoy it.
For example, on the US iTunes store, Osmos currently has the following rating distribution:
5 stars: 155
4 stars: 7
3 stars: 1
2 stars: 3
1 star: 5
It also has 117 user written reviews, which are almost all great!
But... the first, "most helpful" review is a 2-star complaint about the game. <shrug.> So, instead of (or in addition to) writing your own glowing review about Osmos, please band together and click "Yes" next to "Was this review helpful" on others people's great reviews.
Here are the App Store pages: