I agree with the above comments. Green for a shiny color is largely disliked because it not only seems lazy but also is rather repulsive on Mons that the color shouldn't be associated with. Some Mons look fine with it as a shiny color (like Zubat and Masquerain, for example), others look rather, well, almost like they're diseased or pulsating with nuclear radiation or something like that. Green just doesn't fit certain Mons as well as others. In terms of, say, yellow, it doesn't get much gripe because most of the time it actually fits the nature of the Mon, like Luxray, which looks killer in yellow and black, and is an Electric type, which is often associated with yellow. However, a lot of the time, shiny colors can actually be rather bad, usually because they are a bad shade, don't fit the part, or are just a plain eyesore, like Mudkip and Geodude. But green gets the worst of it because it doesn't fit well with many different Mons. The ones that do have a natural green color or do have decent shiny forms tend to wear it well, but shiny green tends to come in a variety of bad shades and choices, and seems lazy in some cases, so that's probably why green gets hated more than other colors.

Now, to answer your last question, my favorite green shiny is Zubat (and it should be at this point, given that I've caught nearly 20 shiny Zubats over my various gaming adventures). I prefer to leave Zubat alone with its shiny color as the pinkish shiny Crobat is off-putting to me.