So, a couple of things on this (and I’m merging your other post into here as well since it’s basically the same topic).
Missions are intended to be the primary XP gain in the game. There are missions for killing monsters (which is what you would do if you prefer to grind monsters to level), there will be missions for doing public events, there will be missions for doing battlegrounds, etc. In all there will be something like 110 missions in the final game (there are only 28 in right now). So basically leveling to 30 will largely be a case of go get missions for stuff you like to do, then go do it, and a lot of that just isn’t in yet.
Regarding dungeons in particular, the balance of dungeon XP vs public event XP centers around the fact that public events aren’t always going to be available all the time to do, whereas you can always get into a dungeon any time you want. So they are probably always going to be worth more “XP/hour” if you are just counting the time spent on the actual event. When you figure there are only evens every 15 minutes though it evens out a lot more (you can’t get that same 3K XP every 5 minutes back-to-back-to-back, basically).
It is true that just straight grinding monsters is not worth as much XP relatively as it is in original Orbus. We are trying to get away from people just literally grinding the same worm mob over and over again for 5 levels as the quickest way to level up.
Finally, any comparison to the current game’s leveling curve/XP requirements is just wrong. We’ve re-done the whole curve. For example it only takes 65k XP to go from 19-20 in Reborn. The XP curve is no longer exponential. It only takes 78k XP to go from 29-30. Etc.
Hope that helps clear things up. But I hear your original point about “I just want to level up with dungeons,” and again there will be some capability of doing that, but at the same time the game is really focused around the missions which encourage you to do a variety of things.