This plugin is designed to insert a piece of code into your WordPress website, which will automatically remove the WordPress version from your header.
This very simply works fine - it's easy enough to look at your page sources and check it - so not sure what the low ratings are about either.
Not sure why this one has such a low rating, it works fine and does what it says. I have installed it on about 10-15 sites (v3.3.1-3.5.2) with no problems so far.
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