If you consider all 3 pillars of play and the 3-5 roles within each of them, the top 3 classes from level 1-10 are the "expert classes"
Ranger
Rogue
Bard
As they can excellent at 2 pillars and fill at least 3 roles in those pillars with little cost.
The bottom 3 is dependent on what you emphasize
Single pillar? The Warriors- Barbarian, Fighter, and Monk really only can fight at low levels. And they can role-locked. They can only fight well in the method of their build until post level 11.
Cost? The Priests- Cleric, Druid, and Paladin don't have the resources to do a lot without leaning on subclass or getting to post level 11 play to get a ton of spell slots.
The Mages- Sorcerer, Wizard, and Warlock can be build for multiple pillars and roles depending on spell choice. But they are hit harder by focusing that the Experts.