I haven’t read the one at mattkubes’ link but here is a great explanation of the Traditional perspective from the Remnant:
remnantnewspaper.com/Archives/2010-0615-ferrara-rosary.htm
Just to clarify, nobody (that I know of) thinks the luminous mysteries themselves are evil or anything… but because the rosary is a private devotion, the degree to which Catholics sort of presumed that the 4th set was “supposed to be there” after Bl. JP2 came up with it is a bit unfortunate. There are many practical reasons why adding them is a bad idea in the opinion of many Catholics, all of whom are free to pray the rosary any way they wish. Please do read this article when you have a chance, it does in depth into the issue of the rosary’s “triune” character and the interesting history of Pope Paul VI setting an arguably wise precedent to not change the rosary, etc etc…