I've heard the game is pretty huge, so the question is - doesn't stuff get repetitive after dozen of hours, that would potentially burn me out?
Are quests getting more complex as you go on, are there any plot twists, is itemization and char build any good in the long run?
Thus far there aren't really any plot twists, the quests are still kill Y bring Z, itemization is pretty straightforward, and character building doesn't get super complicated though there's a smidge of wiggle room. All that said the combat does get a little more involved after 20+ hours into it. I'm not speaking with authority since I'm a bit over 30 hours in and I'm not an Avernum/Exile pro but it is repetitive but if you're in the mood for that it hits the spot. Almost like playing an old Might and Magic where you mow through the vast majority of encounters without the slightest bit of thought and only turn your brain on in a few situations, but you enjoy filling out and exploring the map and watching your party get more powerful.
And for the quests getting more complicated, I'd say no with the sole exception of a dragon's magical knowledge. I've got 3 different people/factions who want it and I assume I can only give it to one of them once I get it. Given the nature of the game thus far I don't expect that'll really impact the story though and it probably just changes what reward you get. Other than that I think every single quest has been completely straightforward.