Many times battlegrounds will turn into a warcraft nightmare. I highly suggest trying to get with an organized premade. We have found such a premade with an awesome BG leader.
Not all premades go smoothly. Folks seem to think just because they are grouped together they will win but in many instances you have too many folks giving opinions of strategies which just confuses things and people will do as they please.
You need a strong leader to direct and monitor activities. Someone who has a plan and ensurse everyone sticks to it. Our guy simply says "do exactly as I say and we will win" and we always do. (err maybe 1 loss) He is constantly watching and moving folks where necessary. As if directing an orchestra to the crescendo he moves his groups strategically from point to point until we have a perfect balance and finish with a win.
I initially found it difficult to follow his direction as at times it made no sense to me, but his bigger plan was very clear to him and he knew exactly how to bring us to victory.
Participate in premades you see in trade chat until you find one that seems organized with great leadership OR perhaps YOU are that great leader?
I love to BG so if you are ever on Bleeding Hollow, look me up and I'll be your pocket healer:)
Here are a few links for some BG strategies...
Check out Cynwise's Battlefield Manual for some great BG strategies
(Thanks to hubby for creating the fun image for me)