I think it just depends on the person. I'm more of a fruit person. I do eat vegetables but not the "recommended" amount and according to my blood tests I'm not at any disadvantage for not doing that. My brother, eats them like no tomorrow and could care less about fruit.
I think the only time you can over do it is when you start getting an upset stomach from all the roughage!
Also, if I remember correctly eating raw will give you more nutrients than cooking them or even steaming them.