Your build seems fine for facing(though beguiler is probably better for what you want to do and could be played 1-20). The only trouble is ,as i have seen other characters like it, in combat you usually are gonna windup a liability which is fine if your party can handle it and if not.. well oh no. So i will second the it depends on thep arty. If you have a full party and you are that illustrious 5th character all is good. If they are depending on you for trapfinding or spellcasting in the primary you are a liability