I will disagree here.
I think you are over analizing the situation. Here why, the EX cards in my mind are actualy very good and add a new layer of complexity to the game. OK, people think there overrated, I disagree, I think most card in any EX pact are a welcome adition to any deck. I play Rafess and i have seen that i can improve my game by buying the EX card. I have also found that the EX card can and will be danced around very often. Your packin a lawtia angel your making invulnerable with def: fine SS assasin, EXDefeu, dispel, or any other number of thing. The point is that the EX card add something to the game which i am glad there is.
Hell, i have heard talk about how Gowen angel is great, What about EX:Azure dragon SS that i think is so good: +10 atk +10 def +1 agi perma.
I think we get plenty for what we spend on I't cost me 5 dollar to get one pack. I spend more than that on candy each day. I do love my sweet!
The point is that the EX card while not stellar for most people are deeper than what i't seem and i hope to make my white angel sing very soon.
I am more terrified of light that leave no shadow then of darkness i't self.