Sorry Lokamp, but this is where I draw the line. It takes an incredible amount of work to make a good Vocaloid song, as well as to produce the background music. The way you're going, you're disrespecting a lot of artists' work. Maybe the limited experience with Vocaloid songs you have are with less skilled producers, and I'm not denying there's a lot of them (yes, Sturgeon's Law), but you're not going to stand there and accuse people like cosmoP, supercell, Jin, kemu, 40mP and 164 as being unprofessional. They work hard and I don't know why at the very least you can appreciate that. Hell, even Tatsh made a couple of Vocaloid songs, are you calling him unprofessional as well?
No one claimed that they were trying to 'improve' a song with Vocaloid, it's just an arrangement. It's the same reason why other people remix classical pieces into different genres: they just want to interpret the song in a different way. Whether the arrangement itself is flawed or not is another matter: the point being no one here is being arrogant and claiming that their arrangement is better than the original. So please, stop putting misleading things like that up.
Music is subjective, Lokamp. One man's meat is another man's poison, I get that. And you're entitled to your own opinion and freedom of speech to post about it here. But please, for goodness' sake, think about how your expressions can affect other readers. If you say you are intentionally raising a fuss because you hate something that much; well, that's just immature. You could at least be a little civil about it. I'm sorry, but I really am very annoyed by the constant bashing.