How evil are wring wraiths anyway?
Let us sum up the pro's and con's of the Nazgul. It seems the only fair thing to do:

pro's:

- They try to kill Hobbits.
- They have very cool red eyes
- They fly great big bats
- They don't look like Elves

con's:

- At least one of them is royalty.
- One presumes they don't shower very often

So where does this leave them on a scale of 1 to 10. 1 being as evil as Mother Theresa and 10 being not just as evil as Margaret Thatcher?

I'd stick them personally at 3. As evil as Woody Allen without underaged family members in the near vicinity.
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