Hearthpwn

This is my version of the Paladin control type deck, with a twist. Playing with it so far I've gone from rank 10-6 pretty fast(for a control deck) losing only to face hunters and 1 zoolock. 

Just looking to share the deck and get some feedback from other Paladin enthusiasts! 

Hmm, this looks interesting. I like the implementation of Leeroy, it is something nobody would expect from a Paladin player. However, I don't like Blessed Champion at all. I know it's a great combo with Leeroy, but its uses are extremely limited beyond that. But to each his own I guess.

If Leeroy is your finisher, it's a dead card until your opponent is at your kill threshold, which in some cases may not occur.  I'd rather run Blessing of Kings which is more versatile and still accomplishes the same thing with Blessed Champion.

Modded I wouldn't necessarily compare it windfury, yes the overall damage increase is the same, but the two are built for different situations.
Windfury thrives on being used on mid tier minions (think Chillwind Yeti or Feugen) where it can utilize the 2 attacks without dying.  But you usually want to use windfury on lower attack minions.  Blessed Champion does the opposite it boost the attack so it can attack a super high attack/high health minion (Think Ysera or Deathwing) 

I don't disagree with your overall assessment, it's not a great card and while it can be constituted as a finisher card, It's not a highly consistent one unless you get lucky.