Lowkey, Imoen was my sis before it was canon she was my sis, so Irenicus messing with her was all the motivation i needed to want to ruin his day, way more than i'd wanted to ruin Sarevok's.
A huge downside of BG2, though, it must be said, that everything hinges so much on Imoen. Main plot doesn't make much sense if one, or one's character, doesn't much care about her.
(Of course BG3 doesn't even have that, since the whole tadpole pol hinges on -- what? how much i care about my newly born character?)
Whether you as a player care about the character you have created is a question from the player's perspective that you could apply to any game really. From a character's point of view, wanting to survive is a motivation that you could apply to a larger group of characters than rescuing a companion whom your character might not even like.
