Haha here's a tip: a fusion rifle works really well against oracles. If your team can't beat them, then switch to fusion rifles. It should only take like two a shot (use machine guns on Atheon). MIDA, word of Crota or anything without oracle disruptor is not effective against oracles, no matter how good it is in other parts of pve. I've even played with people that will boot people using hand cannons other than Fatebringer against oracles since they do so little damage. Scout rifles and hand cannons are good because of critical hits, and you can't land critical hits against oracles, so something like a fusion or auto rifle works better (unless you have oracle disruptor)