Alright, just did it again and the dungeon is definitely doable! However, I do believe ArenaNet should have kept the rewards in silver and XP the same.
Also;
On the part where Magg blasts the door, there’s no way you can kill them all within the 200 seconds seeing as they spawn too fast. It’s still basically kiting them around the room, except you do it for longer now. The timer between waves spawning needs to be increased if you expect us to kill those things instead of kiting.
Lava field isn’t too bad if you did what my last group did. All of you get fire extinguishers, push all the way to the end and then clear any monsters attacking you. After that just get Magg close enough to the magmacyte and you’re good to go.