Regardless of current IB, drift is a special kind of PvP in Destiny. It's different because the objective is not just to kill the opponents instead you have to ignite the enemy's rift.
A few rules will help everyone new to this.
Don't rush to pick up the charge. Picking the charge and getting killed while holding it gives 400+ score to the other team. Instead, only pick up the charge when your team has secured the area. Note that if you have picked up the charge after killing the opposition then there is a big chance that they have spawned near their rift and may be camping there to defend it.
Defend your runner. Try sending 3 in front of him to clear the path and 2 with him to protect him. A dead runner is useless to your team. Hammers, stormcallers are useful to create holes is enemy defenses. However, remember that all the enemies will most likely spawn near their rift so be prepared for another meeting.
Kill enemy runner ASAP. Carrying the spark gives points so stragglers will cause you score damage. If the enemy runner is guarded then thin them out otherwise they will shoot you while you are chasing the runner.
Kill and kill as much as possible. This is ideal when waiting for spark charge.
Throw lasting effect grenades around charged spark to make it difficult for enemy to get close to it. Bubble with saint14 also helps here. You can't pick it if you can't see it!
Runnig with spark gets distance score. So if you picked it up and are surrounded by enemies just run away. You will get some of the distance score so best to run towards friendlies and regroup. Keep an eye on timer though.
Don't jump high into enemy rift. You can just walk to it and slam the spark. Jump makes you a more visible target in open maps.
PS: I am a scrub but now I see players much worse than me so this post is for those who can benefit from it. Elites can ignore it or contribute as they like.
Edit: and yes, IB with Rift is pretty bad specially after new messed up match making (MUMM). So you need a lot of patience above all. It's frustrating beyond any other mode of this game.
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The best strategy I use is blink and shadestep. The harder it is for them to hit you the better.