Yes its easy once you get a good group who knows what to do, 1 person on the switches on the lava buckets running between all 4, this person needs perfect timing.
Other 4 team members all go ranged, ignore the adds there pointless just kite them, 4 members pull the boss while doing full damage on him always staying infront of him at long range pulling him from lava bucket to lava bucket.
You have to keep him flamed 24/7 so he can't heal and just keep pulling him in a large circle between buckets, focus damage and if everyone does it correctly in about 10 minutes or more he should be dead.
They need to add waypoints, add repair stations in between each mini dungeon, give more break options in between each mini dungeon and fix the dis connects issues for players to get back into the group.
They also need to add the ability for someone to leave and someone else to take that persons place on the team. Incase you lose someone.
If they put all that into it would make the dungeon alot more enjoyable.
Yes, we lost a few people and had to regroup again. But yeh we managed it in the end, first time we did it he literally regened all the time :e and never lost health even with superheated. Took us 25 mins but we did it xD The giant stone behemoth chained up thing...that map is the BEST LOOK AREA in the whole of gw2. Amazing