So S4 is much improved overall - still, one thing I am not 100% happy with is the process of trying out different builds in mid/endgame: it takes me more than 30min to completely change up a character, from skill points to paragon to aspects, gear etc. That is super tedious and kills for me a bit the fun to try out new stuff. I am too lazy to have 10 alt chars.
Currently, I have all classes brought to the PIT with the following builds:
Necro: minion build, easy no problem. but a bit boring I have to say, that nothing else is exciting in this class.
Sorc: incinerate build. Quite fun to play, most fun overall I would say. I want to try out a new build, but am too lazy atm to go through all the changes. The overall build is a bit squishy for me and I would like to try something else, frozen orbs.
Druid: the only build that felt competitive to me is the druid wind shear build. A pity, as the basic skill builds are a bit lame to play.
Rogue: the leveling was ok-ish, I played some barage and stuff. But currently, in the early endgame I can only play Heatseeker - again a basic skill attack. Boring to play for me, but all other builds either need a unique that I dont have right now, or feel clunky to play.
Barb: barb is with Sorc the most fun. I played a twister build through levling up to early endgame. Now changed to a razorplate (I got it randomly) + bash build - it is way way stronger than all the other builds and I can just run through the dungeon and clap everyone - hilareous!!
I wish that all of the core skills would lead to competitive builds that could be used. I further wish there where more of these. Atm it feels really limited in what you can do. The whole paragon board stuff does not really change up your character in my experience, but only strengthen the one you have. So you are playing the same build for a very very long time.
But overall, leveling times are much shorter now. Nice. I do wonder why they even have a world tier 3 though: I stay there maybe for 1h max, then move on to WT4...doesn't make sense atm to me to have WT3. It also just feels the same as the start of WT4, so I do not really see the point of it to be honest.
Overall, I have to say, D4 is much improved in S4.