Hellooo all, as topic. I'm talking about the recently added Molten Facility dungeon.
I've done it a few times now, sometimes successfully others not; it seems some players have a hard time grasping the mechanics even after I explain what to do. I did it with a group of my old WoW guildmates from our recent disband and conversion to GW2 and some of them commented it was one of the most fun boss-fights they've ever done. It was their first dungeon experience in this game being ~ level 20-28 (hooray for upscaling)
I realise "fun" can mean different things to different people so instead of specifying exactly what my guildies said they enjoyed, just answer and you can add your own reasons in a comment. Did you like it because it was hard, it was fun because it has interesting mechanics? You didn't like it because it was too easy, you haven't killed it but it was fun anyway and you hope to get it down soon. Whatever!
For myself I found them enjoyable; there's a lot to do and it really feels like a well put together fight. I never found myself getting 1shot and not knowing why. Every time I was downed it was my own fault and playing as a team felt fairly important (keeping the Berserker away from downed players if he's on you etc so others could revive)