Winning is definitely predicated that your team members understand the objectives and kind of know how to work together.

I've noticed that people are not rushing into an area we don't control to contest it and are jumping near/on a vehicle before it makes the next checkpoint.

As a Bastion what I need is either someone with a shield to block damage for me, or someone with healing to help me when we are facing an onslaught of opposition.

I rarely get either.
It's all about teamwork.