A mid-core content for mid-core players.

[Khalithar]

I do not like it much, cause you put the fate of the runs on few people while others has zero responsability.

What Thayos said is actually pretty normal for a lot of raiders using ventrilo/teamspeak though. Raiding throughout WoW, Swtor, and a few other games as a raider or a raid leader, we always designated a person as a "caller" that called out the main mechanics to watch out for, having one person focus on calling out mechanics freed up other people to worry about other things and we kept the channels clear so everyone was able to hear them and pay attention. Other people only called out relevant mechanics if they had to, i.e. the caller would warn us of major attacks while the tanks would call to each other for swaps or cleave mechanics.

Who your caller is depends on the fight and your group. In one guild I was in, the main tank (usually me) would call out mechanics but in fights where I was tanking a particularly large raid boss and couldn't see what was happening, I'd have one of the healers or dps do it. In another it was always our raid leader who was a ranged dps that did it. You get the idea.