Campbell
Relaxed Intensity
Classes that feel like the class from first level, including subclass choice. If I want to play a more Strength oriented Valor Bard I have to play through 2 levels with an atrocious AC and nothing to back up the intended feel of the subclass.
Less disjointed resource management. Classes like Monks and Paladins often have several different pools of resources to manage that it can be hard to keep track of some of which renew on short rests and some of which renew on long rests. Some like Channel Divinity and Ki are in a combined pool while things like Lay On Hands and Bardic Inspiration have their own pool for a single ability.
Clear templates and more precise design language. Lay out the book so it is easy to use in the middle of play if you need to look something up.
Less disjointed resource management. Classes like Monks and Paladins often have several different pools of resources to manage that it can be hard to keep track of some of which renew on short rests and some of which renew on long rests. Some like Channel Divinity and Ki are in a combined pool while things like Lay On Hands and Bardic Inspiration have their own pool for a single ability.
Clear templates and more precise design language. Lay out the book so it is easy to use in the middle of play if you need to look something up.