He's pretty bad. His stats aren't terrible (except the 9 con), but he is the worst type of bard: a blade. His battle song never improves, he is stuck with very few spell memorization slots, can only cast level 6 spells at max, his lore is half, his pick-pocket score is one-quarter of a normal bard, and even with the offensive spin, his THAC0 is pitiful. He is dead weight.
If he were any other type of bard, he would be much more useful, IMHO.
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"This place will be your tomb."