Originally Posted by
Arkenvis
I believe that most Legendary Dreadnaught abilities are solid for any fighting style, provided you can work in the feats needed to make best use of the destiny. Also, the T4 Shadowdancer autogrant would give you 3% doublestrike to your main hand, since you intend to use rapiers.
The biggest issue with LD is fitting in the feats on a build that doesn't have many to spare--Various abilities call for Power Attack, Cleave, Combat Expertise, or Improved Sunder. The destiny loses a lot of flexibility if your build can't fit in at least 1-2 of those four feats. Personally, I'd favor Power Attack + Cleave to work up Momentum Swing/Lay Waste.