For the Bloodthirsty i had to camp up onto of one of those buildings on plaza with shock charges and taction on as a wildcard and flashbangs, the main perk was scavenger cause i was using the attactment where you have 3 fired bullets at once, and also the one that which is like a wierd sight thats thermal.
You haven't seen another diamond assault shield because you don't see that many people using assault shields period. I see diamond SMG's all the time because 75% of people use SMG's and a percentage of them have them diamond. It's the same with Assault Shields in that there is a percentage of people who use them that have them diamond, but the percentage of people who choose a Shield as their primary weapon in the game are not 75%, it's more like 2%. So the odds of seeing a diamond one are pretty low.
I'd guess the majority of people who have diamond assault shields or cross bows boosted for them, as they do with AR's, snipers, pistols, etc.... I have diamond AR's. I don't feel like I'm in an elite group. I feel like I'm in a group of mostly boosters and a few people like me that grinded it out.
Well Mr. Pro, I'd love to see your K/D with using ONLY the Assault Shield then we can talk. Since it doesn't take "skill" to gold it, and once again I have to show a definition:
2. competent excellence in performance; expertness; dexterity: The dancers performed with skill.
I grinded diamond specials, and now I can't stop using them. My shield class is a refreshing change, expecially since I'm no longer trying to get bash kills. I've been trying to find good spots to set the shield up as cover, and I've been frustrating people like crazy. The ballistic knife class is hands down my favorite class when I'm having a good aim night. Too bad I couldn't get diamond combat axes too!