I notice that most of the negative comments and poor ratings given to this software are by people who also don't have a grasp of english spelling or grammar. These signs of idiocy or laziness clearly indicate the root of the 'problems' you folks have with this codec pack.
The only issue is with the Moonlight MPEG-2 filter which is not an MPEG-2 filter at all (PowerDVD or InterActual should be used instead, thankfully, these are distributed along wit the package anyway).
Provided you configure the Codecs you wish to use, set the merits in order of preference and don't overload your system with irrelevant dsp's etc. then you'll have no worries and find this package is very useful indeed.