I lurked in the DAI MP section today and found a thread where people are thanking the developers for their work. Became DAI MP after the Dragonslayer DLC so good now, which is worth playing again?
Short answer - no, nothing has changed, if you didn't like it back then you're not very likely to like it now. It's more stable now but iirc wasn't the technical issues that made you quit. And some convinience stuff that makes playing the game and managing inventory much less of a wade in general but 'twasn't the dlc that added those.
The new map is terrible for reaver/katari too. They need to buff grappling chain so it drags the entire spawn to you rather than one guy, that'd be more like it.
Dragon battle, well, not really impressed.
Did not play any of the new characters.