It can be good, it depends on the implementation but anything involving humans running it has a higher chance of failure imo.
Humans are intrinsically corrupt and evil, and occasionally if not frequently downright incompetent. Failure is pretty much assured.
Some sort of automated system would be best. Sure automated systems can have bugs but those can be tweaked easy enough.
I think that's why we've since moved to instanced raids. I can't say I'm sad about that. "Line Waiting Simulator" is not an interesting form of gameplay, and, as Xenich points out, not everyone wants to fight for their spot in a bloody PvP engagement, and I agree that there is little to be gained by forcing them to do so.
Lets see... you claim "blatantly corrupt admins involved". Funny because I played on a server that did exactly as I explained and what you describe NEVER happened. Regardless, what part of "separate server" do you not understand?
All admins are corrupt. I have never seen an exception. Even if you haven't personally encountered it, it's there. Any human involvement is a thing of EVIL.
As for taking a mob, I am talking about raids (contested group content is fine). You won't take a raid mob in a game like EQ. You will die quick as the opposing force of players merely attacks a weak point in the raid setup to watch your entire raid wipe. PvP raids didn't exist unless there was an agreement between PvP players. Otherwise it was just chaos with raid bosses never being downed.
Hah. Where I come from, not only is that commonplace, but you pretty much set the other half of your guild to protect you from that, and abort the mission if the enemy penetrates the perimeter. The number of guildmembers raiding is only half the equation there, those NOT raiding play the equally important role of guarding the rear from the attacking enemy players who may try to stop you. Hell, I personally practically never actually partook in the raid part, because, well, my interests favor the meatier part.
How many games have you played serious raids with extremely weak points in the encounters (ie you make one small mistake, you wipe) where the content was contested? Or is this another one of those "you heard from a friend and so you are an authority?" I mean, we already know you don't know shit about EQ because you never played. /shrug
Lots, actually. Sometimes the mistake would have been showing up to begin with, and if the guy whose base you're raiding shows up, it definitely gets VERY contested. EQ raids and the like are, fundamentally, at their core, meant to be beaten. It's a very defeatist design. Raiding a player's base, on the other hand, in an environment where they place the map and guardians? This is NOT something meant to be beaten, and some of these were downright fucking mean in ways that you'd never have encountered. You were not meant to succeed. You were meant to die horribly. And yes, this qualifies as PvE as long as nobody shows up, and frankly, we planned these attacks after weeks of careful activity tracking for when they weren't around for this reason. But it's not your common raid PvE. This is PvE played for blood. This is a raid you weren't meant to win, that the designers did everything they could legitimately do to make the task impossible for you. When you've partaken in raids like that, every other kind of raid just seems defeatist by design.
Not all of these raids were necessarily hostile acts, either. Some of us took to basically constructing dungeons like this for kicks, just to raid them ourselves, and these things were HARD AS HELL, because the entire point of them was to literally be IMPOSSIBLE. Some of these were never conquered. Not that this stopped us from trying, because if someone says it's impossible, you just know someone will want to dispute it.