I know what you mean. (It's one of their better features in my opinion.)
Besides as you mentioned in your game against them they have atrocious dice for their multimeltas. (Mine as well, sometimes they do ok but often they just miss. At heat 1 in at least two games my speeders were far more effective at killing tanks with their assault cannons and heavy bolters.) I believe melta weapons are cursed. To be honest I often have more faith in my krak grenades in some circumstances. (One game against a hammerhead both bolters and grenades were more reliable than the multimelta.)
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