I really don't see what the problem is. The grind is at a very reasonable curve since it allows everyone to make progress, even if the only have a couple hours to spare a night.

The only time leveling gets insanely fast is around the 45 range when you do strongholds, but at that point I don't think it matters much since all you're really learning are higher tiers of what you already had. You should already know what do at that point on your class any way.