I wouldn't call myself very good at freerolls, my best finish is like 88th :P I know it isnt very good. I am starting to like the limit freerolls, i.e. Omaha and HORSE. I have found that the chance of me going out early are far less.
Now to answer your question. If i have less then a pair of jacks and there is a big bet out on the table most of the time I am going to fold. Even with lower cards on the board the chances of sets are far greater with so many people. Bluffing
doesn't really work in the opening rounds, everyone is looking to horde chips at whatever cost, some will make terrible calls with just draws and out draw you. Unless you have the nuts I wouldn't risk myself early.
In the early rounds if the blinds are say 10/20 and you have 1,500 and everyone limps around ill call with just about any hand, seeing a flop for that cheap will only help your chances, after the flop I usually get out unless I catch a monster.
Hope this helps a little....