I agree - the theives in Bg2 aren't much good at actual thieving stuff. But you can get by with Jan if you have him from the beginning. If you leave it too long all his proficiency points go into remove traps/open locks until they are stupidly high but he still can't hide in shadows. I personally think Necromancers are seriously cool at high levels. Mages can take out whole enemy parties with the right spells.
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