Actually i have the helm fully upgraded as well and i play as both striker and defender depending on what part of the raid im doing or which crucible game type. The blind of the grenades is just as effective as the bubble plus it damages. I prefer use my bubble away from enemies and use weapons of light for max damage... No need to blind enemies when you can just kill them instantly. To each their own when it comes to which exotic to wear but its rediculous to say the armintarium (however its spelled) is completly worthless when grenades charge 3x faster then supers.