Elves and Ringwraiths

[Gurthang]

Does anyone besides me find it rather ironic that the men who accepted the rings from Sauron became more powerful than elves?

Now, it is generally assumed that on a normal day elves are more powerful than men. Not necessarily in strength, but in will, magic, skills, and vitality. But, the men who were consumed by the nine were different. They almost gained more from their 'transformation' than they lost.

One perk is that they became invisible. This would come in handy for eavesdropping , but it also creates a good fear tactic and would be useful in combat. They became semi-immortal. They could not die, and their spirits would always remain even if they were defeated, so they never could truly be defeated.

Due to these changes, it seems to me that the Nazgul became more powerful than the average elf. They were seduced by their rings(which is bad), but ended up more powerful than before(which is good for them, bad for everyone else). Which brings me back to the beginning. Doesn't that seem like its backwards?