1. Have noticed people destroying other peoples constructions. Just because they can.
2. No direction in the team just everyone out their for themselves. Could because it's a Beta.
3. MAP size could be the issue also. If a map is to big then people just spread out all over the place no matter what the objective is.
MAG had specific objectives and a direct route to follow which was pretty much come in from the 4 sides towards the centre. People could get through the lines, cause mayhem behind the lines which distracted people from defending in the outer regions also limiting the abilities of the force Defending. ie. destroyed radars, mortars etc.
At present I would take MAG and WarHawk over StarHawk but it is still Beta so fingers crossed things pan out.