I do have to say though, bug fixes in any development environment especially game studio happen separately too content so these things run side by side. Many patches have been released fixing bugs, and there are very few in DDO. Some are annoying and have persisted true, but on the whole all serious bugs get fixed in a timely and responsible manner. The new enhancement system is far more robust, easier to understand and flexible than the old system. You don't have to keep looking at "Show unavailable" all the time so you pick the right feats and enhancements. You have your tree, you can see what you can get by going x levels or by getting y feats and you do it.
The new content is great, as are the mechanic and gameplay changes. Hell I even rolled a Cleric this update, I never saw that coming, I can actually understand clerics now! However nothing fundamental has changed apart from the UI here and how I take the skills and enhancements.
So please tell us which bugs you are referring too?