Here's my thoughts on Thaz and some of the issues brought up so far. I'm in <Prophecy> btw.
Earth: Trash requires us to pay attention, but is not overly difficult. We do have people die to DB's and stuff though every clear, but usually it's not too many and I think is probably more us screwing up tbh.
Mini - he's good, except he won't drop a pipe for me. Also about 50% of the time we get lag spikes close to the start of an AE phase which is super bad news and results in multiple people being very dead. Dunno if that is related to the script of the fight itself or if its just bad luck from the server.
Boss - His melee damage towards the tank seemed like it was as it should be, no red flags there. As for the AE's, our best geared caster is probably
Malafixo who has a little more than 5.2k HP unbuffed. All of our casters sit in the 4.8-5.2k range, with about 10% spell ward. Our healers are in the 5.5-6k range, I am at 6.2, with about 10% spell ward. I'll leave it up to others to decide whether we are on tier geared or not. But if the casters aren't topped off before the AE starts, 1 or 2 of them dies every time. With a hot rolling, everyone still ends up under 30, many around 10%. Heaven forbid I had to heal the tank and didn't have time to prepare for the AE and I end up with 2 people left to heal. We have geared up a little since our last attempt on this mob, but 200 HP isn't really that huge of a difference so /shrug. I don't have logs of the fight but maybe the other AE that he does throughout the fight still is rolling during this phase too?
Water - For mezzing purposes, my enchanter has CE2, and overpowering calm 1. I should have a CE3 item but we don't kill some mobs very often, and when we do they don't drop the gear I want anyways. Our other ~on tier enchanter has CE3 and OC1. So that's the level of mez bonus I'd say is fair to expect on tier. Certainly not mez-master Tevinter level.
The golems are annoying, but I don't think we've fully figured them out yet so I will hold comment on that, other than that mezzing all 4 requires the enchanter to do literally nothing except spam mezzes, or one gets loose.
Mini - we've only had I think 2 attempts on the boss and they have not lasted long at all. One we got steamrolled by Lorash'Dal because he activated right at the start of the fight and it all was over in about 4 seconds but that got changed so yay. The other time I died about 15 seconds in to the adds, and the rest of the raid died within a minute. I don't know what Lorash'Dal did, because I was dead. He might have smashed people, or maybe tanks stood under his nuts and laughed at him so he ate them.
Air - the Arc Keepers did not seem to be functioning in any way that we could figure out. Sometimes they died quietly, sometimes they picked 6 completely random people to nuke for 18k, or 21k, or 50k. Walls didn't matter, distance didn't matter, aggro didn't matter. 6 people had their heads a splode. We settled on burn and cross your fingers that nobody died. This was maybe a month ago though.
Mini - we sucked, we died, nothing to see here.
Fire - no attempts yet, but I think we are hoping to give it an attempt soon, so feedback will be on the way!
Sorry if this is rambling, just wanted to give some perspective from a roughly on tier guild. I know we had people watching us for most of the time, and we all appreciate the work you've put in to it.