Got 3 things to suggest from a PvE tank perspective.
The Maelstrom's Sword/Mace: Your Low Slash grants 430 additional damage and restores 232 additional Stamina on your next fully charged Heavy Attack within 5 seconds. While equipped, grants 1651 additional Physical and Spell resistance.
More damage is fine, more resistance is great but 232 additional stamina on a fully charged heavy attack is very very low. 232 stamina is a fraction of my total stamina pool as a tank.
@Faulgor suggested in another thread: For 5 seconds after using Low Slash, heavy attacks restore 200% more stamina.
This would make it far more interesting and useful with the added benefit of making tanks more independent and less reliant on templar healers for extra stamina recovery. Which would then also mean healers using other classes would be more usable in group content.
The Maelstrom's Shield: This has a stat enchant and thats it. Seems kind of pointless since it will make it fairly useless to take over a crafted set shield for example. I wrote a suggestion in another thread about it that I figured I'd share here. Having the shield affect another skill would make it unfair, so how about making the shield have a synergy with the 1h weapon. It would also require you to have both of them equipped to gain the full effects.
"
After using Rampaging Slash(1h weapon effect) your heavy attacks do X% more damage and has a 25%-50% increased attack speed for 5 seconds."
So now using both of them as a tank I'd have the option to drop my defence to do a bit of extra damage, go on a short rampage. The new bosses in the Imperial City dungeons do a lot of damage and quite fast so heavy attacks are risky to do, with that increased speed it would be more manageable and fun in my opinion. A short window between boss attacks, hit rampaging slash, drop block and get some quick heavy swings in then raise shield again.
Mark of the Pariah set: I love this set. I love the 5 piece bonus. Increases resistances based on missing health, the more health I lose the harder I become to kill. Love it. But I'd personally like to see a 5%-10% additional healing recieved from all sources added to that effect on top of the resistance gain.
(Please be a good looking set..)