Im currently trying to figure out a good tactic for Loatheb. I just wonder one thing, I know that the doom will start at 2 min mark and then every second. Though I saw on wowwiki that it will start cast every 15 seconds after 5 min mark. Can anyone confirm/deny this? Would help alot, even though I think that he will go down before 5 mins :)

If you 'know' it will start at 2 minutes and then every second, why would you believe something on WoWWiki?

I don't know if its one or the other, I've never done the fight, but trusting something like WoWWiki is somewhat...suicidal.

2:00
2:30
3:00
3:30
4:00
4:30
5:00
5:15
5:30
5:45
6:00 (lol)
.
.
.

If you're going to research a boss just watch one of the dozens of videos out there to see the timing yourself.