Are you talking about D:OS ? ;P Game ends if your 2 chars die. And you are dropped on a beach as source hunter with no notion what source magic even is. Or what a source hunter is. (Sorry, I don't mean to be snide, but that just jumped at me ;P)
No worries about the remarks, they are fair.
- In D:OS you lose if all your party dies. In BG2 you lose if the main character gets knocked out, regardless of the state of the party and if you could revive him.
- In D:OS you are dumped in unknown Cyseal with a goal: solve a murder, and are quickly directed to Arhu and Aureus. In BG2, you are dumped in a huge capital city with loads of side quests shoved in your face at every turn regardless of wether or not you are actually able to complete them, and all you got is litterally "onoz! Evil sorcerer!".
So, yeah, there are similarities, but they aren't handled the same way and it makes a difference.