I agree with the OP, but that's because I remember my old campaigns of 1e/2e in high school, when after 4 years of weekly play, we ended at lvl 13 or so.
While that may have been slow, I have always found 3.5 waaaaay too fast compared to this.
The real problem came when we played a living campaign, and a player joined our group part ways in the game. Due to RL issues, he always missed the beginnings of our games. So he was eternally late in levels to the rest of the group, despite being one of our best guys. That was right unfair.
Now, I use the level as needed and have ditched xps entirely.
But honestly, it depends on your style and conditions for the campaign.
While that may have been slow, I have always found 3.5 waaaaay too fast compared to this.
The real problem came when we played a living campaign, and a player joined our group part ways in the game. Due to RL issues, he always missed the beginnings of our games. So he was eternally late in levels to the rest of the group, despite being one of our best guys. That was right unfair.
Now, I use the level as needed and have ditched xps entirely.
But honestly, it depends on your style and conditions for the campaign.