I know this post comes late but still wanted to share my expirience of Fili (again) and DN. Pity Bullroarer tests were not carried also trough the weekend but I understand that time was of the essence. Now I guess true testing will happen on LI servers.
Your feedback is much appreciated. The vast majority of the feedback I've seen has been very positive, and I'm glad that most people seem to agree that we've struck a pretty good balance: instances can challenge you and boss fights are long enough that you have time to engage with their core mechanics, but none of these instances are very punishing overall. (One notable exception: I haven't seen a group yet attempt Dar Narbugud on level after these changes. DN is designed to be the most difficult of the level 60 endgame instances, but is still not supposed to be on par with the difficulty of a modern T3/T5 instance).
Filikul
My mixed lvl group tried today my idea of battle of attrition with Filikul but I guess it is imposible after due to lack of enough hps even if ppl are sturdy and won't die from few ticks from bleed - on prolonged fight we will run out of strong stuff (heals & buffs) and ofc such tactic will rob us of dps (since we used 6 healers

). So Fili as intended will stay as dps race only (in my eyes too).
Dar Narbugud
Just 9 of us today: 4x60, 1x71, 2x75, 1x 83, 1x84. Tanks on lvl and one healer on lvl too... but its irrelevant I guess.
We didn't stand a chance against troll bosses. Raid known very well to us. Few tries. Now indeed it is not your avarage raid. We manage to fight long but after all sooner or later buff on boss make their dmg the same as bleed with Fili. So... again dps race... but this time against buff instead of bleed. Bleed resets on death but buff not so they didn't give us hope... Thus lack of possible testing of rest of bosses ofc
While Fili was mentioned to be nerfed and give us hope to do then on standard servers DN with standard group you can get around lvl looks impossible and will be left for very dedicated pro builded mid lvl groups (classwise) or for overlvl groups. I'm happy for Mordor and Angamr folks since you will have really nice challenge - at last I think so. But after looking at current state of mid raiding on my server, and what I can squeeze of it, I think it won't be easy to find and convice ppl for such stuff. But lets see for myself before I look for others.
an 8min fight length puts that dps value at only 5277 dps, and thats not even taking into damage increasing buffs/debuffs like Oathies, Reveal Weakness, ect.
Altought I tanked today I tested my dps on snow dummy (mit 0). My yellow rk won't be even taken to any of this dps race raids with his 4483 (I keep silent about my red warden possibility

).
*Grand Stairs changes - I'm not sure how strong above mentioned changes will be in there but I hope they will consider the fact that GS is instance lvl 56 and is avaible for ppl with mix of gear 50-55 (so out of 58 sets). Most of feedback (mine too) comes from charcters maxed on lvl 60.
I guess this will be my final post in this thread. I wanted harder Moria and I get. Even harder then I can beat. Pity that major way of changes comes to dps races since they are defintly not suited to me and my friends (we prefer mechanical, coordination challenges) but others who like such stuff now may shine
Cheers all.