This is a really useful tool, but there are some changes I'd suggest.
First, it pulses red and sometimes, out of peripheral vision, I think I catch Orange, only to go back to that target and find I still have a great hate lead on it.
My suggestion, stop the animation. It's a distraction.
Red Star - you have more than a 20% hate lead against the target.
Red Oval - You are the target's highest enmity target but within a 20% lead.
Orange Oval - You are not the target's highest enmity target, but are within 10% of it.
Yellow - You are not the target's highest enmity target but are within 25% of it.
Green - DPS Harder, this thing's never going to hit you.
Further, a suggestion that I've seen before: Show raid marks in the enmity list. I'm not huge on marking. I tend to mark <1> each pull, but some tanks like to, and some fights, it's actually useful to mark a <2>, or CC targets, or whatever (not so much currently, but who knows).
I've made a cheap mockup based on a screenshot I had. Behold the power of MS PAINT.
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