I got to pug it the last hour or so with some cool people on TS. The 'trash' bosses went well but the final boss was too much for us even though we got quite far. You require A LOT of damage and furthermore there is a lightning field that zigzags through the battlefield and everytime it pops up at least 4 people need to stand in it or you're pretty much wiped. (this was the main thing we struggled in. Also this makes it seem like going in without voice chat would be really difficult as you have to announce the location of the lightning immediately).
I started as a full cleric healer but I generated way too much aggro so I changed to a condi build instead. But all in all it was really fun (heals are actually helpful, even though not necessary depending on the skill of your group). You needed to balance your party out with Condi dealers, Full dps and Boon strippers in order to be able to defeat the last boss, which is cool because that means they are actually fighting against the zerker meta. Although the dps timer counters this a bit.
I probably won't do the raids until I've completed the full HoT story and gained some more ascended stuff/masteries (masteries are actually helpful aswell).
In short: LIGHTNING LIGHTNING LIGHTNING