I would be more interested in work being put into having several different ways waves of emenies work. One called down you have to use X strategy and then next call down you have to use Y strategy simply making it harder does not necessarily make game play more engaging. Forcing me to change...
I don't want F2P but I would like to see a trial deal that lets you try be for you buy after the game is fully released. That players who are not sure if they want to send the money have a chance to see what it is their money is buying them.