Well, it depends on what playstyle is effective for you. For example, with myself, I love going in and wiping out teams, so often after the opponent grabs the Rainmaker, I dive right in, take them out, and isolate the other teammates while my team focuses on bursting the shield.
I also try to flank whenever we have the disadvantage, instead of charging into a team fight. It allows me to neutralize the turf, fill the Special Gauge, and eliminate teams easily. I also flank to take out other flankers, as well as to make another route for the Rainmaker to use.
My role is easy to understand but difficult to master. Take out all your opponents so your team can make a lead. The consequences of this role is relying on your teammates to focus on the objective. Also, you will rarely ever pick up the Rainmaker, unless you picking it up can gain the lead last minute.
Another important aspect is the map. Watching for ink trails will tell you where your opponents are so you can splat them when the opprotunity arises.