I'm fine with whatever others make- providing it's not
too sore on the eyes. Sometimes, that luminious green and pink monstrosity isn't such a great idea; they're occasionally physically painful to look at- which makes roleplaying with such characters a difficult feat (unless you're equipped with sunglasses...)!
In terms of character design, I tend to keep my own realistic- though I've two with unrealistic (though very muted) colouration. Even then, I've no preference as to whether the roleplay's an unrealistic fantasy or a realistic pack- I just prefer natural colours on my own characters.
Nearly all of my characters are realistic, or try to be as near to it as possible on FeralHeart. I've downloaded mods for realistic fur textures, mask, and even realistic roars and howls. XD Love me realism, I do.
It's mainly the serious RP characters that are really realistic; the ones that I just sometimes derp about on are more semi-realistic. I have to look up the species of my character on google or something when I'm in the process of making it, just so it looks as realistic as it can.
I can't think of a good reason why I don't like unrealistic characters...I just don't. I think it's may because it sends out the message (to me at least) that the person didn't really put much thought or effort into making their character and just threw some bright colours together. But I'm not totally sure; must just be one of those things that gets to me.
My unrealistic characters (one's in a serious, long-term roleplay!) often take
longer to make than my realistic characters- mainly since I attempt to make them
look like a plausible creature, as opposed to a spontaneously throwing together a mishmash of neon purples and blacks. Not all of them are lazy; even realistic characters can easily be made with a haphazard mixture of muted brows and greys with ease!
I do understand your point though; everyone has their own personal tastes! Just had to ramble a little, apologies!