Most powerful race/class combos? Least powerful race/class combos?

[htabdoolb]

Been thinking about this a bit, and I wonder what other people's opinions might be. Every race has its advantages and disadvantages, and so too do the various classes. Which of these build upon the strengths of the other? For example, the classic combo of an warrior ogre. The ogre's natural high strength and stamina, combined with frontal stun immunity, make for a good pairing with the warrior class's needs and abilities.

Then on the other hand, what might the opposite be? The least powerful pairing of race and class. Especially if we opened up race restrictions for each class. Would an ogre enchantress be the most pitiful, or would it instead be the high elf warrior?