Mid ranks can be frustrating as some players have better equipment, however persevere and spend your crystals wisely and you will improve. Communicate during battle to effectively organise your team, dont go for flag all alone! Try to find your role and choose your equipment accordingly, do you protect home base with a heavy hull? go for flag with a light hull? or a little of both with a medium hull? Also the type of map should dictate your choice of turret.