I didn't find it hard to read at all. Nor did I find it poorly organized. What put me off it, though, is its extremely repetitive nature. Having to do essentially the same series of adventures four times - with slightly different window dressing each time - doesn't sound all that enjoyable to me. I would've been happier if the lairs and the cult's abilities were more noticeably different.
I can understand this, but I think the devils in the details.
Each lair does offer different opportunities, some are more RP focused, others hack'n'slash is basically your only option. Also, it does have those side quests to break up the dungeon crawl.
I've almost finished City of the Spider Queen after 8 months though, so PoTA seems like its filled with amazing variety compared to that.