In D2:ED entering Maxos temple finished a quest that brought me up to level 15. In DKS there were some balancing changes (a few people mentioned being a higher level getting to the place you first meet Talana without doing anything differently compared to D2:ED), but I'd guess there are probably a few other areas or quests left to do in Broken Valley.
BTW, at the end of Maxos temple you will gain access to Sentinel Island. Your first encounter there you can mindread to go up a level, so the higher level you are (in D2:ED I made it to level 18 in the fjords) the more of an experience bonus that will be. You don't need to get to a high level, but it would be better if you got to a new level before entering, to get a full level bonus.
