Oguz, in siege it really depends on the teams and the map if you win or loose
some maps are easier for defenders, some are easier for attackers, but mostly the teams are quite even
the only problem is that the attacking team mostly has a small advantage since the only thing they mostly have to do is a simple charge
while the defending team has to watch out where the attackers are going to charge; also, they constantly have to keep an eye on the flag
the problem here is that the defending team often just also simply charges the enemy (as the attackers do), mostly defending the walls and completely forgetting about the actual flag, there´s barely something you can do against that ;I (BIG WRITTEN MESSAGES like "FLAAAAAAG" or "ALL BD ENEMY INC" mostly help since they stand out of the other text messages in chat[or simply go commander])