Loot is my biggest issue this expansion, i do some of the hardest content (relatively speaking) in the game and the loot i receive is worse than if someone gets lucky on a Mythic+2. warforge/titanforge is the worst system blizzard has ever come up with, it makes planning upgrades and character progression paths a pain in the ass, i much preferred the 0/2 upgrades you could do on items with valor (conquest?) points. make items harder to upgrade for example an 885 item being upgraded to 895 could require points you only get from mythic+10 or higher, or from mythic raid content. but upgrading an item from 875 to 885 could require points from mythic 7-9 relying on the rng gods (even though they have been generous to me this past evening) is god damn ridiculous.
for legendaries there should be a way to target specific ones, let me set a mandatory 3-4 that i would like and guarantee the next drop will be one of those make it cost something like 30k-40k order resources or something, or require clearing certain content before the follower quest pops up (heroic raid content in the current tier or mythic+13), or allow me to sell my current legendary for an increased chance for my next one there are numerous ways they can improve the system to cut down on the RNG madness that is happening.
WQ are a waste of time if you are higher ilevel with the exception of the tiny chance to get a legendary out of the emissary chest, i normally go out of my way to do the 3 "kill one elite" quests (warriors with the Order hall upgrade can instant complete 1 per day so i only have to do 3) its cool if thats your thing, a lot of people enjoy them but its just dailies rebranded.