I started playing it a couple of times, but I also dropped it without finishing. I wasn't very lucky in getting into a dungeon that was too high-level for me (even though the game is already quite hardcore), and there are no proper save points, and the game has a very inconvenient and unfriendly system with travel and time limits. I thought about trying it again some time ago, when they added the turn-based combat mode, but I never got around to it. What I didn't like:
1) This whole thing with limits, travel, and so on. It doesn't add any positive aspects to the experience.
2) Skill checks, where you need to level up a skill to a certain level and you have to save-scum to succeed in something. At least, this didn't need to be directly transferred from the tabletop system, as the game format is different from live modules. Some checks are also hidden, meaning they happen at the beginning of a conversation and, if successful, simply add additional dialogue options. I'm not a fan of this approach and I don't think that to access certain content that is locked behind character skill requirements, you also need to rely on randomness.
3) Alignments. While in the prologue, they show a pretty good approach to them (although it's worse than the approach where there is no such thing as alignment at all), where any of the protagonist's actions can be justified from various perspectives, this is not the case in the rest of the game. In addition, many of the choices are locked behind the character's alignment and do not move him in a given direction. Moreover, they are locked in a rather strange way, such as the need to take one of two sides in some conflict at the very beginning of the game if the character does not have a neutral alignment. Because, of course, a non-neutral character always cares about the squabbles of two barbaric tribes.
4) The quality of the dialogues and descriptions leaves much to be desired, and many characters are either poorly written (like Valerie), or complete idiots (like Lady Jamandi), or have a rather repulsive character, like the half-orc and half-elf duo or the halfling bard. The latter is especially bad because she can't be kicked out of the party, and the story is told from her perspective. The developers clearly wanted to create their own Varric, Dicken, or, at worst, Grobnar, but the final result left much to be desired.
5) There are problems with both the balance of battles and the options available to the characters.
That's what I remember right now.