No...not all large files are fakes! Just keep searching & you could eventually find some good sources.
If a file downloads a certain % then stops, could be that the host of that file has gone offline. You may well be able to resume that incomplete file later.
The speed of a download depends on a few factors (your speed, host(s) speed, how many upload slots the host has open, how many hosts you're downloading the file from etc).

Have you seen these stickies? They might help you out:
How to find music
Fake files showing up in search results