1) I think the Aesdale/Blush/Althon/Icar/Paraway/Kessa/Markessa storyline needs a little work. It's very confusing, especially is you miss dialouges. I think making sure the player sees all of the neccessary dialouges would help, otherwise some things don't make sense, like Althon telling you abour Icar and Markessa's involvement in the slaver fortress without the player having heard of either of them.
2) The Myth Drannor dialouge is a little info dumpy. The quest is good, but the dialouge with Ilewthary, and the dialouge with Pelja after that, spoils it a little. I think maybe summarising, and giving more NPC/PC interjections could make it a bit more interesting, and maybe give a personal viewpoint from Ilewtahryn/pelja, retelling it as they saw it. Some of Rihn's dialouges could do with that as well, making it seem more tragic, as the character describes how they felt, what it was like. The dialouge with Rihn outside the ruined shop works really well because it comes from her personal viepoint, and describes her feelings.
3) I've mentioned this before, but I think in Mistmoor manor, the player should be given a hint to look for Vildamyr in the basement, otherwise the player may never go down there, and maybe add a variable so Rihn only appears after you find Vildamyr. Makes things a lot less confusing.
4) The slaver series could do with a bit more direction. At first you know you have to escape, and get to the Temple, but after that you sort of wander about the Temple, then there's a hint that you could go to the Big Slaver Fortress, and then you sort of wander around the big fortress until you stumble onto plot events, which is a little confusing. Maybe have someone in your party coment that you have to get after the slavers to rescue the other slaves/ Chaarna. And once in the fortress have someone perhaps telling you where to go, or giving a hint about what needs to be done. as is, I don't really know what I'm supposed to be doing in the slaver fortress.
Apologies for the length, I got a little carried away

Thanks