I disagree. I just got my BLM from 31-50 in 6 days just leve grinding with 1 another person. Granted we put in long days, but still.
In almost any non-korean MMO, I could do the same thing (traverse the majority of the EXP reqired to reach max level) in the same amount of time if I put in "long days." This game isn't any faster or slower to level than most others I've played.