Congratulations on easily killing the hells out of the entire grove without any difficulty whatsoever, you must either be either very experienced, well setup, fortunate enough to come across some things I probably missed or have read a guide in advance.
You can tune your sarcasm down ... i never said easily.
I was just idiot who didnt long rested before fight, and sold every usable thing except healing potions.

So i had to improvize.

Given how straightforward the goblincide path where all you do is go to positions x, y and z to whack three baddies without much in the way of setup or preamble..
And on Evil route you simply lure Druids out and let Goblins to take care of them ... then you simply clean up leftovers, and voila! :P
- Never found the Paladins so, I will have to take your word for it.
- The zentarim hideout is locked behind checks, traps and is pretty easy to miss in the first place.
- After the one scene with minthara you are explicitly told not to go back to the camp, so the goblin vendor is out.
- Volo, never freed him from his cage, freeing him didn't seem like the evil thing to do (more on that later as it's pretty relevant to the overall main point here)
- Okay ya got me on the underdark point there as there are two vendors in the colony.
And i specificly told you that: "
some of them you will loose too, as story goes ..."
So i take this as agreement.
Not payout, loot.
Payout is what you get from someone, who you do "some job" for. > Minthara paying you gold.
Loot is what you find out by that one you did that "job" at. > Artefacts you mention.
-On the "good" playthrough you get a bunch of sweet weapons, sweet equipment, an absolute trove of stuff to sell off to a very easily and immediately accessible vendor, along with a straight shot into the underdark where even more treasures and such are to be had directly from the goblin camp! On top of all of that a freaking badass druid joins up and hangs out in your camp.
Items - Wasnt one of your compainments that goblin camp becoming hostile, and Minthara attacked you? Gues what that means ... all this loot is obtainable, for evil playtrough as well.

Vendor - We allready talked about that.
Underdark - Yup, goblins are holding one of four entrances ... and yup, you can use even that one, even if they are allready hostile to you, it takes some work and few spells ... but its possible.

Additional treasures - As far as i know, all Underdark is connected, so in theory, you should be able to get all "even more treasures and such".

Halsin - I get you like his model, its quite nice character ... but Minthara is too. :P
-On the "evil" playthrough you get a few greens (some of which can be acquired on the good run if khaga gets poisoned...) , a lot of grey stuff to loot and sell if you can find a vendor, and a poorly animated sex scene with a woman who immediately tries to murder you! Assuming she doesn't then you get sent through some cursed hellhole (that we don't have access to as far as I know, might be better or worse that the underdark) with a crazy as your guide.
I dont remember i ever posioned Kagha ... thanks for the tip, it seems like i will have something new to discover in my next playthrough.

You get POTENTIAL sex scene ... and you get it from both sides, only for "evil", if you insist on that word, its Minthara, and for "good" everyone else who you have enough reputation with.
She also dont "immediately tries to murder you" unless you do something pretty stupid, like lure in her head for her sectets.
Also if you play your cards right, all those dice check i have seen so far in persuating Minthara to side with me ... was all dificiulty 1.

-The fighter pulled a knife on me so I talked her into letting me slit her throat, sure there were options to keep her alive but that's not the evil thing to do now is it?
I dare to presume you have played this once? Twice max?
I have around 9 playthrough behind me so far (yet i still find things that i missed), and the only situation when Lae'zel attacked me with a knife, was related to me using tadpole powers, no matter wich side i join.
-The wizard attacked shortly after and was unceremoniously stabbed/clubbed to death.
This for example never happened to me ... i wonder if he consumed any magic, or if that was act of pure desperation.
-The warlock dies in the raid.
And you decided to not ressurect him by scroll, nor talkative skeleton because ... ?
I think i have located actual source of your problems.

Do you know how many folks left/died on the good guy run? NOBODY!!!
Then you probably tryed harder.

Which is just plain counterproductive and stupid on the whole.
In the way you are presenting it? Certainly agree.