Alright, I know a lot of people are not going to share my point of view..
This series are pretty good, yes, great gaming experience, but the only thing I've never liked about the saga is that you are able to keep playing even after you completed 100% of the game. I understand that I can keep playing after finishing the main quests, but I just don't feel right to complete the sidequests and guild storylines when I know I finished the main purpose of the hero. Then after you finish the rest of the game, and get everything there is to get, what is there left to do? Wander around the world or mess up with the game's engine until you get completely bored? That's not how I like to stop playing a game.
So my point is that when you complete the most important quests on the game (main quests, all DLCs and guild quests) then there should appear an ending DLC that ends the hero's journey definitively. Yes, like Fallout New Vegas; you're not able to keep playing the game after the ending. But why keep playing, when you know there wasn't much to do after you've done everything? A definitive ending would give a feeling of achievement, of conclusion. Instead of this feeling "I got bored of this game, I have nothing more to do so I'm going to leave", you will rather have this feeling "Ahh, so this is the end, once and for all, it was a long journey but it was very fun and this game left me a very good taste".
And the definitive ending DLC should only appear when you've finished everything else in the game, otherwise it won't appear up. Maybe the hero should be given the choice of sacrificing himself to defeat a major threat, or introduce roleplaying aspects that involve your character's past or feelings, or an existencial crisis where the hero feels like he has nothing else to do because he already did everything and therefore has no objectives left, so he fights his spiritual counterpart or something like that..
This is just my opinion, I personally hate when you're given the chance to keep playing a game when there really isn't much to do because you ran out of stuff and quests to complete, so you have to do repeatable stuff like killing bandits and generic enemies without storylines, which is pretty pointless since you're already geared up and all.
Thoughts?