Evil path is so much worse than the good path. You lose two companions
(and only because Shadowheart vs. Lae'zel isn't implemented yet; otherwise it'd be - 3), even though the current companions were supposed to fit the evil party. The drow cleric tries to murder you and once you murder her in return, all the goblins turn hostile again, instead of accepting your character as the new management. Finally at some point Halsin (not shirtless, unfortunately) tracks you down in the camp and tries to murder you too. On the upside, you progress to hand holding with your evil dream lover. But only if you convince them with the right conversation option, otherwise you try to murder a thing which only exists on your mind. Don't ask me how.
For comparison, what the Lich mythic path gives to me on Pathfinder : Wrath of the Righteous?
- The ability to reanimate dead during the crusade(HoMM3 style which is very fun).
- A undead "pet" which can be upgrated into a caster
- A Lich separated spellbook + ability to channel negative energy, healing my undead army and damaging enemies.
- Unique spells and SLA for lich which can't be obtained on normal spellbook
- The ability to change my damage type from any elemental spell into negative
- A Ziggurat where undeads are made
- Undeads roaming my city loyal to me.
I din't ascended to lich since stopped playing on ch 4 since I don't get to spoil myself that much. And a amazing adventure with a lot of side quests. Places to explore and etc but I will not spoil a game on beta here. Only say that the Demon mythic path is also amazing. I an only lv 13 exploiter wizard/4 mythic at moment on my demon path on the beginning of chapter 3, so I can't detail much more. Only say that I loved to encounter Nocticula.
The evil path on D&D games which offers that path always was great. The soul eater on NWN2:MoTB was amazing. On base nwn2, you could ally yourself with the final boss and murder your party members. My very first RPG, Might & Magic VII - For Blood and Honor allowed a cool evil path with dragon "hirelings", lichdoom and unique dark magic skills.
If you are losing 3 companions on mythic path, you should get a lot of power in return. Maybe a wand of finger of death, which can only be used once per day, at end of chapter 1. "but it is op", no, finger of death on Baldur's Gate 2 OHK anyone which fails a save. Pathfinder 1e nerfed it to mere 10 damage per caster level(200 at lv 20) and 5e nerfed that spell even more. You need to give a lot of power to the player to compensate all lost and risks of a evil path.
A D&D game doesn't need evil path to be good. Dark Sun : Wake of The Ravager is my favorite turn based D&D game and has no option to play as a evil character.
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TL;DR - Swen encouraged people to play evil. And evil path is the worst of any D&D game.