When it comes to freedom and customizability when building a character, Ultima Online did it best with a wide selection of skills that would CAP at 100 each, your character would have 700 total skill points and you could distribute them literally, any way you wanted. You could be a 7x 100 GM or have 100 in 5 skills and 50 in 4 others.....any combo you wanted.
Why has no other game been able to successfully copy this system? Darkfall was close but it was a Greek game and uh....ya..... (I'm Greek so I can make fun of my own culture, its allowed in the SJW handbook).
Dragnon - Guildmaster - Albion Central Bank in Albion Online