NonSensi-Klown
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He had, become quite worthy and talented according to both the Emperor and Vader by the time.
He was talented yes, because had the skywalker potential. That doesn't nescesarily mean that his bladework was Jedi level.
Also, Vader killed a Master in ANH.
A master who was a shadow of his former self with a lightsaber and hadn't used one in years?
And again, the fight was, imo, superior to what I saw of Aragorn in all LOTR
I dunno. Aragorn fought hordes of orcs and Uruk-hai by himself, defeated Lurtz who was above average in skill, and managed to defeat the majority of the Nazgul by himself on Weathertop.
http://www.youtube.com/watch?v=AJqrWssQSxI
http://www.youtube.com/watch?v=rDQU9iPxO6o
http://www.youtube.com/watch?v=f4XMgQUqLZ0
I don't think that what we've seen from vader in combat speed is far superior to Aragorn's blade work. I'm not exactly sure who would win but I think it's pretty even.
EDIT- Pretty much any Jedi from the PT would destroy Aragorn in a duel, but I figured that Vader, being a deal slower then them and using a form that is made primarily of heavy two handed strikes and the like, would be more even.
As for offensive powers, I mean no push, pull, choke, grabbing Aragorn and other objects. He can not use any abilities that would affect either their surroundings or Aragorn himself.