Youre making the error of thining f2p models are going to be run as a charitable enterprise. Theyre not. The company are going to need to raise substantial revenue somewhere to aid continued support and development, especially when theyre straight out of the box like this. This means the major problem with the f2p model is that you are guaranteed a two tier service. You will have to expend some cash somewhere in order to get to the premium tier.
This is futher compunded by the fact that when it relates to a 'skill based' shooter like this, by making it f2p from the start, in order to be the best you are going to have to pay (presumably items and equipment, upgrades, vehicles, wings? etc) plus be skilled. If youre just skilled with retarded equipment, youll die to the big guns on the average guy flying around your head.
Finally theres the question of ongoing development. Models like WoW spend all their resources on content, patches etc because they know that they are enticing in more subscribers by improving content. F2P models spend more time developing the stuff youll need to pay for, content and items, because those folk paying for it are keeping the game running day to day. the folk getting it for free are just using up bandwith.
Therefore, shame its F2P because it looks well promising. Who knows maybe theyll figure out something new.