I didn't vote because I don't always hate LEDs, but I'll say this about it...
I hate not-tasteful LEDs.
Long story short, a couple years ago I had an accident that really harmed the vision in my left eye and made is to that I have a lot of light sensitivity in that eye, particularly when it is dark and moves to light. Going to places that are constantly flashing lights (concerts, musicals, etc) give me almost instant headaches because of it, even though 90% of the time I am not really bothered by it.
When people put in the SUPER BRIGHT LEDs all over their machines, I absolutely cannot stand them. It gives me an instant headache, and I can't watch the machine. Having said that, I really do like LEDs in a lot of applications in machines. My VND, DM and Batman Forever are all 100% LEDed, most of my backboxes get LEDs to cut down a little on the heat, and I try to replace all of my flashers with LED ones just in case they get locked on, I don't want them melting an insert.
How it is done I'm very particular on. I'm still not happy with my JP because the white flashers at the bottom absolutely blind me, so I've tried other colors, and nothing quite works right. It has blue in it right now, which is way toned down but looks really funny.
I can't explain exactly where the line is, other than my left eye tells me exactly where it is. I also do like machines to look decently stock, so when people change out everything to look totally different, I generally don't like that as much... but then again, I have done that in a couple places on the machines that I changed over, so that isn't a hard and fast rule.
Maybe my rule on what I like is like the supreme court definition's of pornography - I'll know it when I see it.