Try reading the details. Then you'll see why your low ratings are groundless. – Germ Scanner Review

I haven't even used this app, yet. I'm sure it'll stay at 5 stars, because it can't be that difficult to do what it says it'll do. All reviewers need to know what they are reviewing to accurately review something. (Yes, I know I have also blindly reviewed this app).
Review by FollyD on Germ Scanner.