The Lich quest is awesome. Very intuitive. I passed it in one try, and just had to really read into everything and it really set a nice ambiance. Heck, I wanted to read into it because it dripped of so much juicy lore I used it in my RP afterwards.
The psi one is more like, ok do this, neat, now figure this out or DIE!. Oh and this, well both seem right, but DIE!. And if you take to long DIE!!!! Then Anithraril told me i sucked in so many words lol. Second time I got it, but only because I knew what to expect and had reviewed logs of my first attempt for days. The end result was a quest that really contributed nothing to my character other than scaring the shit out of me.
Vampire just had nothing to do with my character, was like ok RP, RP, RP, AWESOME RP with Anume and Chayesh and everyone. Then, do this obscure quest Valadar..ok...oh you got lucky so here is more badass RP (becoming a vampire is so awesome). Which made the quest seem like a requirement that really didnt add to the journey at all. Which is sad in a way, since playing Vampire has to be the most immersive experience I have had in FL.
Frankly I think the conclusion I am reaching is do a Demon quest, especially if it expedites the final step of becoming a demon. But really, make it like the Lich one. Make it designed to teach the unique FL lore, to reveal what it means to be destroyed by a demon so bad that it takes over your freaking soul, and you become it.
The quests should be gateways, the final step, hurdles but more so things that plunge you into the story, not make you afraid you might miss something and lose all your effort because of a prompt you didn't answer correctly.