Today me and @JACKinbigletters are doing something similar to This where I as questions and people vote on what they like. I will than make a RPG with all the data collected. So the first question will be...
I find free roam more fun to play, but fixed path games are definitely easier to make and follow. Depends on how much time you have to build a world/storyline.
I personally don't care very much but i like to be able to do things that would give a bonus amount of damage like a point blank shot over one from 20 feet away. I also like doing things like making new weapons like: http://armorgames.com/community/thread/12373633/highway-to-hell-rpg/page/7 post 7 and 10.