User blog comment:Morrowindman94/Was Alduin cool enough?/@comment-76.17.165.195-20130407193821

No, he wasnt very tough in my opinion, but bear in mind that:

A) he seemed to be weakened by his first encounter with Dragonborn, which explains why he was regaining his strength in sovnegarde.

B) You never absorbed his soul, so it can technically it is possible that he will be reincarnated, way more powerful than before, and fullfill the prophecy.

It can also be assumed that the dragonborn is just immensely powerful, or that Alduin was just immensely weak at the time.

Just my two cents, feel free to correct me.