Personally I think 50% unbuffed is enough, that way most crits will be reduced to normal hits. Values over 50% will only further reduce devastates and some crits that may have more than the normal 150% multiplier. It's not a total waste, but I'd rather get other stats (BPE, Mitigations, Morale, Resistance, ICPR, Inc Healing) at that point.
Used to play: 85 Champ / Captain / Runekeeper / Guardian, Guild Master of everything but cooking.
Playing now: Hellcat / King Tiger / GW Panther / IS / KV-5 / M4 Sherman and more