There are some fair criticisms to be leveled at this game. The path is quite linear and (especially early on) the character's 'soul stories' seem to be expected to do a lot of the heavy lifting for lack of more actual conversation and questing. There's also a noticeable lack of musical variation, I agree. Nevertheless both of these aspects can be explained by a lack of budget and time. Pillars of Eternity feels, (and honestly I'd expected from the outset) an exercise in 'what can we realistically do with the money and time we have?'
If you went in expecting something as massive and varietous as, say, Baldur's Gate: Shadows of Amn you probably set your expectations too high. Still, I'm hoping for (and I'm sure willing to pay for) some expansions that beef up the existing areas and quests as much as adding more. This game did enough that, personally, I got involved and tthought about how my character might work, abstracted my own ideas and responses, and hat's more than I can say for Icewind Dale.
Also, as much as I love PS:T I have to remind people the game is heavily front-loaded. As you progress options and quests seem to dwindle until a totally sparse and sudden endgame. PoE doesn't quite have the same depth and variety of content but it's definitely more evenly spread out.