It's a lot better than running back and fourth to the gold coast after killing some random NCP a 100 times. Instead here we just have to run around nearly every zone. The skill tree also levels pretty fast, Fighters guild, Mages guild, and certainly the undaunted all take an increasingly good bit of time to level up. Fighters guild being relatively the easiest because you can rank 10 by just doing dolmens, but mages guild and undaunted take a good while, and the mages guild is even more grindy than the psijic skill tree.
I think everyone complaining about it not being fun, or being too much of a grind is just being petty. If you've leveled up a single character or more to max everything out then you've grinded for less rewarding things a lot longer than you'll be doing psijic quests.
Master Debater