As for Sadhu, OOB doesn’t deal that much damage. You use it mostly if your other skills are on cd and to use Astral Body Explosion (ABE can only be used when you’re OOB of course, since you explode your soul to deal damages).
So a lot of the time you won’t have it up.
Now the bad side of Sadhu is being interrupted: any hit that somehow makes your character “stagger” or of course any knock down/back will interrupt your skills. It’s like every other classes, but on Sadhu it can be a bit annoying since it’s a rather static fighting class. The skills’ cd are short though, so even if you do get interrupted, soon enough you can attack again.
Plague Doctor 2 isn’t that mandatory, but most people who go PD 1 go PD2 since Black Death Steam deals good damages, it has synergy with PD 1 (if you do the Incineration + BDS combo you deal extra damages), and BDS also spreads through enemies.
Paladins are mostly STR based, yes, it also has two skills that can depend on SPR but one is a shield and the other one has a long cd so you can’t really build around it.
Paladin can be mixed in other builds, but no matter what it’ll make you lose quite a lot of DPS since it arrives at rank 4, its DPS isn’t really good to start with, and sadly its support doesn’t really make it worth losing damages if you have no clear goal.
Paladin is usually mixed with the other Physical classes, like Inquisitor, because they have good synergies.
I really love Paladin too, it makes me sad we can’t mix it with more classes =/
Druid is actually pretty viable~ It isn’t as strong as it used to be, but it’s still good. But you can also just take one or two circle, even if it’s just for Carnivory, as a filler.
Diev 1 is mostly great for the -20% cd. If you have rather longish cd, Diev 1 is really great.
If you go magical, Hexing would be useful for any of your magical skills, that’s the good part. Nowadays it’s popular to do a Bokor 1 -> Sadhu 2/3 -> PD 2 build, which offers both good support and DPS.
On my Sadhu I chose Diev 1 and not Bokor, so I can have Transmit Prana almost up all the time. They’re both really good, it depends mostly on your build and which one you enjoy the most, really.