Look up video files before download with Bitzi. If the file's been rated then you'll get an idea of it's content & quality. You can also rate files, to let others know about misnamed porn files etc. Click on the link below
How to use Bitzi
Previewing the file during download is also helpful. That way, if you see the file is crap you can kill the download!

If a file's stuck connecting & then goes straight to need more sources, chances are it's a fake. Search again. Vary your search terms. Try the All Types search. Stay away from files with huge numbers of sources, try going for a file with 10 sources or less