I have not been playing freeroll for very long but I have noticed something about my play and the format.
1) The standard raise is not quite enough to discourage callers

. You raise 3-4x BB and still can get 4-7 callers on a full table. This make the amount of starting chips irrelevant. Blinds may be 25/50 but you are already having to risk 1/3 to 1/2 your stack on a hand to even attempt to push someone off the pot.
2) You just can't lose 2-3 hand in a row at any time and expect to stick around. The way people bet and bomb all in you have to win early to double up and then go from there.
3) I call it the tidal wave effect. Over half the people will be gone before the first break, and the money will be spread unevenly. After 15 minutes, you will see someone over 10k in chips and you have not even seen a hand worth a raise/call. The reason you know this is he just got seated to your left

and makes it extremely expensive to play whenever you do play a hand.
4) I tend to do alot more folding after the flop. With the expensive betting styles if you don't catch a piece of the flop it is hard to play the rest of the hand. Odds just are not there very often.
Did I miss any?