You don't get the exact same effects from every set of gear. Sometimes you have to shop around and because of the factions only taking crucible marks, which is ridiculous considering that only one of the factions cares about the crucible, you have to play crucible in order to get certain gear. Right now, I'm grinding the crucible because I want a crucible helmet but I can completely understand why people would be pissed if they want a dead orbit piece of armor and have to go through the crucible to get it.