Had 2 predators and 1 speeder left and 11 terminators + Belial left.
He had almost nothing.
He started with: 4 las/plas razors, 3 squads of Missile launcher long fangs, 7 rhinos with double melta and 2 multi melta speeders. and my predators still survived.
They can take more then you expect, deploy them out of range/sight of most the opponents force. Then use terrain/terminators to get them in cover.
AV 13 with cover and if you hold them out of range of melta with your terminators they will take allot of punishment before going down.