Rhykker has provided a very useful summary of the top 2.4.2 PTR builds for Diabro 3. I imagine the final patch changes have been negligible, so this is pretty close to live.
Of most interest: The monk appears to be on top for now, followed by the witch doctor. The wizard is okey-doke, but to attain rank 6, she has to use that stupid Firebird/Archon build, which is too fiddly and relies on an ancient Chantodo set (wand and source). I keep getting non-ancients, but it doesn’t matter, as I have no interest in this build.
A surprisingly popular ring choice with melee classes is the Legacy of Nightmares set, the one that gives you big damage boosts for using ancient legendary items instead of sets. I suspected this would gain popularity once people figured out its benefit and build diversity. This is the strategy Nananea used with her thorns barbarian months ago. Since she is the queen of out-of-the-box strategies, I can’t say I’m surprised.
So anyhow, I am strongly considering a witch doctor build for Season 7, since the chapter completion set will be Helltooth this time. If you care about wizards, they get Tal Rasha, which is infinitely better than the crappy Delsere’s Magnum Opus set. I think all the classes get decent starter sets this time.