MANY MANY files on the network are fakes and useless. If you right click on a file in the Limewire search page ... and this applies mostly to video files .... and under advanced you will see Look up with Bitzi. This will open your browser and take you to the Bitzi site where there may be a review for the file quality so you will see which files are good and which bad. Of course many files are not listed. Listing requires contributions from you and me.
Going for a limewire file with more than about 20 hosts can be a mistake. You probably will be better off with a file with a low number.
I hope this helps