It's all about macro baby
Play passive and tank up beneath your objectives
Watch minimap for opportunities to siege objectives (wait until the enemy is distracted)
If your team is in real trouble, show up and balance the scale
Use FF/HA to make fast rotations, shove lanes fast, or shred walkers fast
You're fast enough to shake one person off your tail but don't get greedy- you're at your strongest when you're defending.