Wail has got to go
I love the Advent..and when I say that I mean seriously I never play any other faction on ICO ever! I have to say though that wail has got to go! The power that it has in mp to change the entire game in literally a few seconds is in my opinion ridiculous. I was in a 5 vs 5 earlier and one of team members got wailed (yes he should have scouted, yes he could have been more careful etc) however after that he never recovered his entire fleet was gone instantly. Yes you loose a planet when you wail but as you know that is little price to pay for what you gain from instantly destroy their entire fleet, you can move in for the kill after such a devastating loss.
I was also AR and every entrance to my empire was covered by wail, my partner who was being pushed back retreated to his ice world which was next to my ice which had wail, the enemy was smart (he is a reg player) but there was nothing he could do because I had wail coverage in three different directions, and his team was all VL except for him which he was the other AR. This led to a stalemate because he couldn't go anywhere and neither could we or we would risk wail. Yes we could try to send in corvs or something to take out the temple of communion but any smart player would have defenses there (I build my temple right next to sb). This honestly needs to go because even though so players say it is situational it is FAR to easy to have wail coverage on multiple fronts, and like Sel has pointed out they can even build it on their own world which neighbors yours and use it to take you out, that is just dumb. The only "counter" to this is to nova them into oblivion but we all know how that works on mp