The Cleric/Thief support group.
I'd like to start an activist network to encourage all those who actually like the cleric/thief to come out and say so. It has to be the most maligned multi-class. Tiaxaphobic comments like, 'I don't get it,' or 'It's just useless' litter the internet.
Fed up being turned away from Feldeposts even though the sign in the window says 'rooms available'? Had enough of the 'special seating area' at the Five Flagons theater? Unite here and make a stand.
They mightn't wield giant swords. Instead they are like the swiss army knife of classes.
If you have no issues with giving a multi-class a kit then they can be great.
Try Priest of Helm/Thief.
You get free True Sights - which can't be sneezed at. You also get Seeking Sword: a +3 weapon at 3 attacks per round. Did you know you can backstab with seeking sword? Add Righteous Magic for strength and maximum damage. Then Add the HLA Asassination.