Yup, same. I can't even say that it's a specific map type - sometimes I'll own Asylum: top score, lowest deaths, kill streaks for days. Same map up next time, opposition mainly the same (ie shotgunners) and 2 - 25, fall off the map 3 times, lucky if I pick up one Special brick, let alone the heavy. Then I go and do it again on Pantheon, Shores, Blind Watch.... Bizarre