I've got a post-20 character, and I've beaten Corypheus and most of the High Dragons (I think I have one or two left). When I first started poking around the new content, I quickly found that the groups of mobs were of much higher difficulty than in the other zones. I'm guessing it's aimed at people who have finished most, if not all, the previous content... and I've still got several zones to complete. I focused more on the main storyline vs a completionist play.
What would you recommend I focus on in terms of gear before I head back into the fray? Most of the reviews just say post-20 but don't really go into a lot more detail than that, and it doesn't seem to be that simple to me. I guess I'm just looking for objectives that I can focus on completing so that when I go back into it, I don't feel like I'm wasting my time fighting things that are harder than they should be because I wasn't prepared enough.