I posted some ideas in another thread about Mace. IMO, his kit isn't bad; it just needs to be tweaked, and he definitely needs a second Special Ability.
I wouldn't mind one of his Abilities getting a Zeta, but I'd rather his base kit be fixed first.
His basic should deal 25/50/75% damage above 50% health, as opposed to the 25/50 that it does now. When he drops below 50% health, his healing should max out at 100% of damage dealt (keep in mind he will be dealing far less now); OR he could gain a percentage of max health.
Smite is in need of a serious rework. There are several toons who have a similar version of it, and they are ALL superior. At the very least, this move needs to be unavoidable. It could probably use a damage increase as well. And if they are going to keep it single target, then it's cool down should be reduced. As it is Sion has a multi-hit Smite that does so much more.
As for a second Special, Mace needs a move that reflects his skills with a lightsaber. It should deal heavy damage for starters. From there, it should have a couple of effects. I like Daze, as I feel this represents Mace's dueling ability. I also like Offense Up, which represents Mace taking advantage of him catching his target off-guard (Daze), and other targets cowering in fear after having just witnessed Mace's raw power. But there are a number of effects that can work here.
Mace's leader skill ain't bad, but the bonus stats could be raised a bit. And he should give half of that to non-Jedi, like so many other Leader skills do. This opens up the number of toons that can be used with Mace at leader.
As for Shatterpoint, well, quite frankly I like it. When it procs (in any game mode), it hits hard. The problem is that it often doesn't proc. It certainly doesn't feel like 45%. And when it does finally proc, it does so on a stealthed target that you can't hit. Or there is a toon who just taunted and Expose targets another toon instead. There are a number of different ways that this issue can be resolved, and it needs to be looked at. Someone else mentioned it being changed to Deathmark, and that could be an option too (though truthfully I forget what that does off the top of my head).