Here is my take on what needs fixed in DDO. Give a more coherent storyline which involves the players in the history of Stormreach and Eberron. I haven't played PnP since before 3.0 rules and came into the game completely blind. So take my opinion for what it's worth. Perhaps people who have been playing PnP have a better background on the lore of the world we play in and for that reason they are better connected to the game. But I really have no idea the overall scheme of what forces I'm fighting against or why.
PnP was always about being a player in a story. In DDO, other than killing things for loot and XP, I really don't know how the different quests lines are related to each other. Where is this Lord of Deeps who in the first quest I was to be made a sacrifice for? Is he the guy in intro movie that rises out of the water? Why is he coming out of the water? Is he Eberron's version of Neptune come to enforce his will upon us? Is he an invading ruler or the strong arm of a yet stronger force? How does he connect to Velah and House K...etc, etc...
Again take my opinion for what it's worth. Maybe I'm missing something or not reading my quest dialogue enough. I left WoW to come play this for many valid reasons and I have many gripes with the design of WoW...but in that game I did feel like I was part of an on-going storyline.