In what I believe was our first full guild mythic+ run, we took on Halls of Valor +2. For 3 of the 5 boss fights, things went smooth, but two gave us some headaches.
For the first boss, it took us a few tries to get a handle on the dragons that drop lightning on the bridge. I think in the future if we stand between pillars we will be able to get out of it quicker and then pull the boss to where the lightning was dropped as it doesn’t appear to drop twice in a row in the same spot.
For Odyn, it took us way too long to realize that it wasn’t Odyn’s AOE attack that was taking us out but rather spells cast by the add that Odyn summons not long before he draws everyone in and casts his AOE. Once we figured that out and focussed him down AND interrupted his spell casting, we finished the fight easily.
For the future, we may want to decide ahead of time in what order people are interrupting so as not to waste them.
Despite not beating the timer, we had a lot of fun, well I had a lot of fun, figuring out what we needed to do and then doing it.