Doesn't look that great and seems like it would become very repetitive. Granted it was in very very early stages but didn't show anything that was that ground breaking. It looked a bit like a very well done mod for Force Unleashed which made you look like Darth Maul and gave you a double sided lightsaber.
I don't know much of Darth Maul or that era of Star Wars but I highly doubt Darth Maul would be in any epic scale battles with the Republic or the Jedi so having a duel with another powerful Sith or Jedi is unlikely as the Sith who are hiding and Jedi would probably notice if one of their really powerful Jedi randomly died.
Who knows could have been epic but I probably wouldn't have bought it. Games where you are playing a Sith or Jedi can be really boring as you are over powered so much that you could just kill anyone and if you were a Jedi/Sith who struggled with Clones or Stormtroopers it would be claimed that the game didn't follow the lore as Jedi/Sith would be able to annihilate a squad of troopers easily. A game where I could play as a Clone or Stormtrooper raises my interest. Much more enjoyable to play as a random soldier or mercenary is much more enjoyable.
I'm not a massive fan of most Star Wars games but Battlefront 1 and 2 I have played so much. They are just great when you are one of the troopers but I do find it fun being able to control Darth Vader or Obi-Wan from time to time but if I controlled them all the time I would think its pretty shit. Knights of the Old Republic I kind of accept when you play as a Jedi/Sith because you usually fight Sith and Jedi often, also its an RPG so instantly raises interest for me.
I wasn't a massive fan of Force Unleashed either...
Might just be me who thinks that way...