I don't think Marr is particularly interesting. I think that he's portrayed as being generally competent, which is such a sharp reversal from most Imp and Sith characters that pro-Imp players are almost automatically disposed positively toward him.
I also don't see why calling Saresh a 'warmonger' is necessarily a bad thing in this particular context. The Republic is at war with
the Sith, who are, y'know, Space Magic Nazis with a waayyyyy longer list of war crimes. The Republic also lost the previous war largely (not wholly, but largely) because its leadership lacked the will to carry it through. Pursuing war with the Sith to the knife, or to unconditional surrender, is a perfectly reasonable policy - maybe even the best policy. Saresh's error with Ziost wasn't that she was prosecuting the war with the Sith, but that she did a very uneven job of it. Trying to direct the campaign from Coruscant and failing to pay attention to the intelligence from assets on the ground was not smart. Invading in the first place might not have been smart - Ziost might have made a far better distraction for Imperial forces instead of being a target for Republic invasion.
Well, since we've gotten on the topic of protagonist voices. Why don't we list our Top 5 favorite?
Go!
1. Female Jedi Knight
2. Female Imperial Agent
3. Female Bounty Hunter
4. Female Jedi Consular
5. Female Smuggler
I don't like the British accent thing from either a lore perspective or an aural perspective; Jo Wyatt is the exception because she's basically perfect anyway.