I was thinking the same thing...
Overall it looks interesting, but then so have so many other Paladin additions. The proof will be in the pudding, or actual game play. My take, as a long-standing Pally intimitank:
-I love the increase to max dex bonus to armor and tower shield. Very nice. If only I'd known this I would not have gone 3 levels of Fighter for the tower shield enhancement. Now with my current build I just need a +4 tome to take advantage of that. In fact, what Paladin tank right now would have built their guy with a high dex in mind if you knew you were not going to be able to use it? So in order to take full advantage of this PrC you will likely need to reroll.
-The AC increase from dodge bonus is very nice. ExcellentBut how long will this boost / stance last?
-Gaining aggro I found is much easier by pressing the intimidate button. A monster running away from you, chasing a squishy? You just have to get close enough to peel off the aggro. Excellent chance of grabbing aggro from a group of mobs? Hit intimidate. The increased hate does look really cool on tier 3. This will be helpful I think against mobs that you cannot intimidate.
-Tier 3 looks awesome! Too bad when I made my Pally Intimitank I didn't know that anything useful was going to be added after level 11 of Paladin. So I'll be stuck with tier 2, or a reroll. I'm sorry, but I've already rerolled my guy half a dozen times over the course of a couple of years to get him right (I am a casual player after all). Not sure I'm thrilled with the idea of doing it again. Think I'll work on my Sorcerer and Tempest Ranger.
So my proposed new Defender Build: Paladin 18 / Rogue 2
Rogue for evasion, intimidate and UMD. As nice as the increased hate will be, I think you will still really want intimidate on this build. And as as much as I think this will end up being the optimal build, I just find it so un-Paladin like to take Rogue levels. This PrC should grant intimidate as a class skill. That way it will make it possible to take 2 levels of Monk to pick up evasion and avoid the Rogue levels. It would also make it possible to make a pure Paladin defender with intimidate.