I'll just do Korn because I feel like it, and because I'm sooo 'obsessed' OMGLOLZ.

This is in order of their albums, and I guess this is just me nitpicking but whatever...
Korn
- For the first album? Nothing wrong. 4 singles and Korn weren't even popular. I think 2 demos should have been finished to be put on the album - "Layla" and "This Broken Soul", but that's it.
- LIP. Official videos for "Good God" and "No Place to Hide" would've been great, but again, nothing wrong.
- Only 2 singles from Follow the Leader, their best-selling album. If "Got the Life" and "Freak on a Leash" got it to sell 5 million copies in the US, they could've at least released one more single. "It's On!", "B.B.K.", "Justin", "Dead Bodies Everywhere". They had so many good choices.
- Same situation, but with Issues. It's not much of a big deal but there really was supposed to be a 4th single. Rumors that "Let's Get This Party Started" was having a Making the Video episode shot were floating around, plus the band has always said they wanted "Trash" to be a single, so I don't know what happened with "Trash" especially.
- "No One's There" for the 4th Untouchables single would've been really amazing. Aside from that and touring with Puddle of Mudd, which was a huge mistake, I don't understand why they moved Untouchables to June 11th when it was slated for May 14th. The only reason given was so that Deadsy--the newest band on Korn's record label that year--could have good sales with Commencement. Uh, it debuted at #100, and the #1 album that week was a f‘cking P. Diddy remix album. Korn could've gotten #1
and Deadsy would've gotten #1 on Heatseekers, because I'm sure albums that debut below #100 are eligible for Heatseekers. Trust me on the #1 issue, P. Diddy sold 263,924 in his first week and Korn sold 495,991 in their first week. Hits Daily Double doesn't lie about that kind of stuff. Really bad move on Korn's part, because Eminem's album came out the week after May 14th, and that really messed things up.
- TALITM. It would've been #3 or even #2 if it had been released properly. That's all I'm saying, and if you think I'm lying then I'll give you some proof [once again, HDD.] Musicwise, it is their worst album, by far, and two specific music videos off of it speak for themselves. Worst decision they've made to date; this whole album should've not happened at all.
- GHV1. "Word Up" video was bad, and the tracklisting bothers me a bit but everyone can relate to that with a greatest hits album. "Thoughtless", "Need To", and "Good God" were missing. Those were all singles, not "Trash" and "Twist" [50 seconds long, come on.] Then there was that damn "Freak on a Leash" remix taking up valuable time...
- SYOTOS. If the 3rd single is "Open Up" or "Love Song", we're fine...