Thieves are nice... But, with the exception of traps, their skills really have no use at all in the bigger picture. Locks? Easy. Bash them. There are strength potions aplenty. Need I mention Crom Faer? Also, Knock, level 2 mage spell. Traps? Use the clerical spell Find Traps and either avoid them, or, use mirror image, spell turning, spell trap, or spells like shield of the archons or death ward to avoid their effects.
Now, for the traps alone, I think a thief is worth it. And maybe a bit of pick pocketing. The other skills? Pheh. A waste of time.
Although detecting illusion can be handy... But once again, there are spells and skills that take care of that as well.
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