I would agree that casters are inherently more powerful at higher levels, just simply because of the range of spells they can cast. You can move vast distances in an instant, cause massive amounts of damage, change your shape and features, alter-reality, etc... In short they can be effective in a far wider range of circumstances than fighter types can.
Melee/non-caster types generally have a far more limited range of what they can do period. Most of them have few knowledge skills, non-combat feats and limited non-combat skills. They fight and perhaps have one or two skills at which they are effective.
Melee/non-caster types generally have a far more limited range of what they can do period. Most of them have few knowledge skills, non-combat feats and limited non-combat skills. They fight and perhaps have one or two skills at which they are effective.