It might be different for highly geared groups, but I have found very little use for +enmity. You need a ton of it before it makes any real difference and I haven't had any hate issues tanking anything so far. For instance, I wear Raptorskin Wristbands over Coral Armillae because I don't see the +0.8% enmity (I suppose +1% for HQ) doing anything for me.