I'm honestly kind of surprised at the extremely positive reception PS:T gets around these parts, between winning #2 in the unofficial Codex top 10, and #1 in that more recent poll. The writing and the story are great, sure, and the game does utilize skill-checks well, but the actual gameplay, as in, the interactions between the character and the gameworld, are fairly shallow.
I've been playing the game through for my third time. Sure, there's stuff that I'm finding that I haven't done before (I had never managed to get out of the Mortuary without some zombie-slaughter, so this is my first time using Stories-Bones-Tell on them; this is the first time I've found the tattooed arm of a previous incarnation in the Crypt of Dismemberment; there are a few minor sidequests I've never done before; it's the first time I've completed the Circle of Zerthimon; it's the first time I've joined the Dustmen). However, none of these new finds actually change the gameplay much, if any. All that the tattooed arm or the zombies tell you is a bit of info that you'd find out later anyways, and doesn't effect the gameplay in that it doesn't give you any new ways of approaching quests. All that finishing the Circle of Zerthimon really does is helps you to get uber more quickly, and improves Dakkon's morale (i.e., gives him a better weapon). Factions in the game are a joke, and amount to little more than "what special items and spells can you buy". Even though there are multiple ways of solving most of the problems in your path, there are very rarely any real consequences for these choices (about the only one I can think of is sacrificing party members to the pillar). There's nothing in the game that can alter the story or gameworld to any appreciable degree; you can't help Gizmo take over the town, you can't side with the Dark Elves, you can't help the Takers overthrow the Shapers, you can't choose to side with Beliar rather than Innos, you can't help one elemental temple destroy the other three. It's a linear "dialogue romp", an advanced JRPG, a Bioware game with better writing. I find it strange that a forum whose mantra is "choices and consequences" would hold it up as one of the best examples of what they're looking for, when it's got almost none of it.