I mean they live to serve the dragonborn and they order you to kill parthunaxx "you're not welcome here until he's dead" WHAT? The only reason you exist is to serve me and you make me kill an ally who helped to kill Alduin?
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This is quite a big reason for me why skyrim was actually a pretty bad game. It's a good example of little to no choice being offered in a game series that's known for choices. You couldn't choose to side with parthuurnax instead (not officially anyway, since you'll still have the quest to kill him). Also, the blades are unkillable.