Not having a Job/Class system in the first place, as it constrains your character too much, often unrealistically so. Weapon limitations, anyone? Have a broad selection of skills, a small amount of learning-by-doing for the skills
The problem is, that very few games manage to pull that off, Nethack (many Roguelikes in fact) and Dungeon Siege are some of the few titles that come to mind.
The Nintendo eShop rating Thread: http://gamrconnect.vgchartz.com/thread.php?id=237454
The Steam/GOG key gifting thread: https://gamrconnect.vgchartz.com/thread/242024/the-steamgog-key-gifting-thread/1/