I completely disagree. This game is lacking in real content to fill in the levels you want to take longer, which would mean more grind parties, which is absolutely no go can not be in any modern games. Those are a relic of a bygone era and need to stay dead. If they added more content to fill the gap, it'd be more tolerable, but remember that for this game in particular it's not just one journey from 1-50, it's many. Not only do some fights have groups requiring EVERYONE to level a job to mid-high level (Ifrit and people wanting Sentinel for everyone), but at the current rate of quest/content creation there's no way they could fill that gap in any reasonable period of time.

I'd argue, if anything, the curve needs to be a bit faster. I'm at level 50 gladiator, and my friend who joined is at level 36 thaumaturge, which he got from PL parties because we want to actually do content at endgame sometime before the PS3 release. Because of the complaints, they "fixed" it so I can't directly help get xp with our gap in levels, so now it's a bunch of leves, soloing, or exp parties he can't stay for very long for because he doesn't have a ton of time in one sitting to burn. He's already starting to lose interest in the game.

Better to have a faster curve with less grind to get to the actual fun part of the game then to make it go on forever so some people can have an ephemeral sense of accomplishment for doing what's expected.