I would hotly debate that Men are uniquely vulnerable to the Ring. Dispite the sad fate of the Nine those Men directly exposed to the temptation of the One actually acquit themselves rather well.
Isildur takes the Ring, dispite being advised against it, but realizes his mistake and decides to give it up to 'The Wise', (see Disaster of the Gladden Fields, UT) which would probably have been a mistake BTW.
Boromir gives in to temptation but almost immediately repents, breaking its hold on his will.
Faramir and Aragorn of course refuse it altogether, and without the light show Galadriel finds necessary.
Bilbo, Frodo and Sam do indeed resist the Ring's power but against them there is Smeagol who falls to it at once, killing his only friend to possess it. It is thus a mistake to think Hobbits have any kind of blanket resistance as a species.
It is also a mistake to think that Elves, as a species, have some kind of immunity to evil. Feanor and his sons, Eol and Maeglin, and for that matter Galadriel give the lie to that. Legolas, as an individual, may be resistant but it will have to do with who he is, Legolas Greenleaf, more than what he is, an Elf.
Dwarves were specifically designed by their creator to be resistant to exterior influences but they are not immune to the corruptive power of the Ring as the fates of the holders of the Seven show. Those Rings fired their Dwarf holders' natural faults of greed and covetousness leading them to disaster.
As for the Angelic Maiar they may be the most vulnerable of all! Certainly Gandalf fears the Ring's effect on him, and Saruman fell through mere desire for the Ring.
No species is 'immune' to the Ring. However certain individuals of all species, including Men, demonstrate the wisdom and the strength to resist it.
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