My current build is balanced. There's not much demand for Marauders, and my other two rank 50 classes are Conj/Thm. If I want to participate in a dungeon, I've got to be able to quickly switch to Conj/Thm.
That means I can't stack points into physical attributes. So I keep everything relatively balanced, use traits to swing my attributes, and use food to supplement. That means I can't min-max anything. Which is a bummer. But that's what I get for leveling Conj/Thm and not Arc.This.
Dex seems to help a little with hit rate, but not nearly as much as getting an HQ Engraved Bhuj. But as you increase Dex, there seems to be a noticeable difference in evasion/parrying.
When I had my Dex at 110, I was a parry-->Fracture machine. I even started putting Haymaker/Jarring Strike on my bar.
The problem for Marauder, of course, is getting Steadfast to pop. You've basically got to make a choice. You can hold still to get Steadfast to pop, or you can re-position yourself to take advantage of Marauder's conal AoE, like Broad Swing, which creates an awesome amount of TP. But you can't do both.
But with Dex that high, I didn't need Steadfast to parry. If it did pop, it was usually an instant parry. But if it didn't, I still parried like crazy (even while wearing a hauby). And I also got to move around and build TP.
People seem to think of Marauder as a fat dude with lots of HP who hits hard. But a high Dex Marauder is a completely different animal. You're not going to get as much damage mitigation as a Glad using a shield, but you're going to do more DPS, and your innate counters will stop the mob from using its WS. If Marauder had a Heavy Shot type attack that depleted the mob's TP, we'd be an anti-WS tank.