From what I understand their reasoning behind not reviewing F2P games is that since the game is free the "customer" can just try it out without risking any money.
I've found out that as I become older what I really want to know is not how I spend my money, but how I spend the little time I have avaiable for games. So I think a review for a F2P game is totally warranted. Is this F2P game worth investing my time in?
Especially when it comes to games like Dota 2 where, in my opinion,you really need to dedicate yourself to learning the game in order to truly enjoy it in the end. A review in this case whould be great, to have a better sense if the game is worth investing time in or not.