The ending was an incompetently executed fuck-up of a bad idea. The emotional investment that ties everything together for you detonates at the worst possible moment. You may have really enjoyed the game before that point, but you will never look back on it in the same light.
EDIT: Believe it or not I'm OK with them simplifying the dialog, at least in theory. I don't think their approach to choice really works. They need to make choices challenging to the player. As it is, I literally know what choice I'm going to pick even before I hear my options. Talk about boring. Another option is to cut out the choices, freeing them up to deliver a more dramatic narrative. I would much prefer the former but either would be an improvement. But let's be honest, we know they used so much auto-dialog to dumb down the game and because it was easier to develop. It certainly wasn't done to tell an amazing story.
EDIT: Believe it or not I'm OK with them simplifying the dialog, at least in theory. I don't think their approach to choice really works. They need to make choices challenging to the player. As it is, I literally know what choice I'm going to pick even before I hear my options. Talk about boring. Another option is to cut out the choices, freeing them up to deliver a more dramatic narrative. I would much prefer the former but either would be an improvement. But let's be honest, we know they used so much auto-dialog to dumb down the game and because it was easier to develop. It certainly wasn't done to tell an amazing story.