How is this any different than bf2, bf3? They released an unfinished game, literally a beta version. Now they are fixing the bugs as they go along. Now with bf4 they did the exact same thing. The game play I hate to say Tony is exactly like bf3 only with more toys. At least in my opinion there really is no difference between the two.
I wish you luck with your letter, but.....they got your money, if you complain to anyone, write origin, you are more likely to get your money back from them than crying to EA. (yes I know they are pretty much the same thing, but there is a satisfaction guarantee somewhere on the origin page)
oh and btw, stfu, put on your little sniper outfit and come play, bugs or not it's still good for a laugh