Freerolls can be very good for practice depending on what sort of player you are. If you want to learn and improve your skills, you will do exactly that.
I grabbed the 2nd seat in ixgames bodog freeroll the 19th april that gave 3 entries to the sunday $100,000 event.
I played with a serious mind!
and this is ofcourse if you get the cards you want, then you will do better than great. Doesn't matter how much you believe in yourself, if you get lousy cards you wont get far.