In some regards I think that makes wizards a challenge to role play well because in general a wizard will be much smarter than the person behind the wizard. Same with charisma... if you're a naturally shy person or someone who lacks tact or "people skills" its tough to roleplay a character with lots of charisma.
Maybe that's why most people tend toward fighter types. Its extremely easy to roleplay STR, DEX, and CON.
