Spent some time with other classes & specs:
Prot Warrior
For all of Bliz saying about pruning abilities, Prot Warrior's a bit confusing at 20. There's no more Slam as a single target rage spender, but curiously Deep Wounds as our only source of bleeds has been removed as well. To get back bleeds, we have to talent into Rend which sits on the leftmost part of the class tree - meaning we forego the tanking talents on the right side. I'm never comfortable without any form of Dots while tanking, but I may try foregoing Rend seeing
@Staffelchef above posted that other AoE abilities' damage have been buffed a fair bit.
As it stands, if we include Rend then there's 4 AoE buttons total to push for a Prot Warrior and I'm pretty sure that isn't Bliz's intention. The rotation is more complex than before with more keybinds lol. WW being more powerful than Revenge could be an oversight & probably numbers might be adjusted later.
But fundamentally the playstyle is similar and I really like Prot Warrior's fluidity; for longest time I thought it would be my least liked tank but it turned out the most fun of all tanks at 20. Just a blast to play.
Priest
What can I say? Renew being axed is huge, huge downer for both Holy & Disc. This means all normal heals have to be hard casted, and it sucks in dungeons especially when wanting to just top people up whilst running to the next pack. I was quite liking Disc playstyle before, but without Renew it has become incredibly cumbersome to maintain Atonement uptime for the whole party, and consequently dps takes a huge hit which spirals onwards of making Atonement heals less effective.
After some rounds in dungeons in both specs, Holy looks better in terms of DPS numbers and delivers better healing capability than Disc despite the heavy losses of Rhapsody, Shield & Renew.
Just as much as healer Priests feel the most gutted so far across the classes I've tried, Shadow Priest has probably the biggest win by having the new tentacle ability for massive AoE QoL improvement. No more tab targeting every single mob to apply instant & hard cast DOTs. It really confounded me when I previously realised low level S.Priests didn't have any meaningful AoE capabilities. On other hand it looks like Shadow Word: Pain damage has come down quite a bit, so single target dps suffers with this AoE tradeoff.
Paladin
In Prot, no Hammer of Wrath just means one less button to press in reaction to procs, so no big deal. Otherwise I'm playing the same as before, with the mastery & other passive mitigation changes not affecting anything rotationally?
For Ret, we have option to play as previous (but again, no active Hammer of Wrath button) since we can still talent into the same abilities, but after some dummy testing, taking the now accessible Avenging Wrath talent is the way to go. Bliz sort of already heavily nudges us in this direction since the free Ret & now passive Hammer of Wrath talent only works in conjunction with Avenging Wrath (both should be merged!).
Here's a weird thing, and I'm sure unintended - taking Avenging Wrath means having to forego Final Verdict, so this single target spender reverts to its base form Templar's Verdict. Templar's Verdict is actually weaker than the AoE spender Divine Storm on single target, so there's really no reason to use the former at moment.
Holy is generally an improvement in healing playstyle, in a sense that the only AoE but seldom used Light of Dawn has no more narrow positional requirement and is now a 360 radius with huge 40 yard range. Still think its too weak though; for a spender it only moves health bars something like 10%.
Pretty surprised Crusader Strike's gone for Holy in the effort to so-call be less reliant on close melee combat, but thematically its strange to be a positionally melee healer holding a melee weapon but having no ability to actually use it other than for auto-attack.
I'm a big fan of the battle-healer playstyle so I do prefer the old Crusader Strike rotation, yet Holy Pally dps was and still is just really low for some reason and the reward for that effort's not really worth it in comparison to say, Mistweaver Monks and Resto Cats.
Well considering the ammount of talents that require a higher lvl then you can pick the actual talent at I would agree with you on this lol.
Wholly agree on this too. Bliz wanted to simplify talents, but its like they have painted themselves into a corner & made many of the talents a straight up mess for lower levels. One pally talent by position near top of tree is supposedly accessible at level 12, but has a straight level 23 requirement hard tacked onto it. Not sure if these talent shenanigans have happened before on previous pre-expansion patches, but I can't imagine Bliz leaving stuff just as it is and I hope moderate rework & refinement be in Bliz's cards for lowbies and levelling toons.