My only complaint about the level gain is that of all the cahracters I've had so far not one of them has ever made level 20. Be nice if I could have a level 20 character one day but the way the XP progression goes on this server that is never likely going to happen as I generally loose interest in my characters well before the cap is ever reached
Like Tarrasque said, I long ago acknowledged that I would never be able to fully experience the end-game content on PotM, simply because by level 14, I either grow tired of the character and start up something fresh or he or she dies for good in a manner that is fitting to said character. This makes the revelation that it's harder to level a new character up all the more frustrating and irksome, in my opinion.
Characters, as they level, receive feats, skills, and spells which help to define them. There can be no separating the levels one acquires and these things that ultimately make that character unique and interesting. They help players fully realize the concepts they have for their character.
The lowering of the XP cap doesn't punish people who grind continuously; however, it
does punish people who play a particular character exclusively for a set length of time and generally don't make alts.