Admin said XP per level is linear and it is.
Monsters experience is linear also.
But they are not linked. The number of kills needed per level increases exponentially per level and that is what your graph shows. For most MMO's this is the case.
No one is right or wrong here, it simply is looking at the data differently.
We can whine and complain about it but without some constructive comments it doesn't have much purpose.
Up to about level 100 it is effective to solo level but after that it really is slow. So I group now and leveling is still going at the same pace for me. With the group experience bonus and the fact that in a group it's possible to kill things 4 or 5 times quicker it offsets this linear / exponential XP problem. With Update 3 I believe this was one of OTM's goals, to encourage the grouping MMO experience in the game. Don't try to solo up to 150, you will go insane (as your graph shows)
They have come out with Daily Quests now, I'm enjoying doing them, even with the high level griefers in the arena

It gives a little XP boost each day.
What I would like to see more of though are the rare Super XP mobs. If my group kills 100+ mobs in a hour, it should spawn for us at least once? Maybe twice?
A n e x a n d e r
Ranger of Avalon
When you are dead, you don't know you are dead. It is difficult only for others. It is the same when you are stupid.