@BristolBachelor
Firstly, you are correct in your assertion that magnetic shielding would have no effect on neutral particles. However, these also don't have very high energies like charged 'cosmic ray' particles, which get accelerated by the magnetic fields of things like spinning black holes and supernovae.
In fact, the Earth's magnetic field also has no effect on such particles, the only defence being atmosphere. I really don't think such particles are a problem.
Secondly, the AMS-02 superconducting magnet on the ISS is only 'the first large superconducting magnet to be used in space' [1], which has a core magnetic field of 0.87 Tesla. This is less powerful than the magnet used in a modern MRI scanner, for instance. Furthermore, this won't be powered by a nuclear reactor, since there isn't one on the ISS (unless that's something else the Russians aren't telling us about), which could pump a lot more juice through it. In a superconducting magnet, the field strength is proprtional to the amount of power put into it, without heat losses (hence superconducting).
Finally, you claim that diverting the charged particles with a magnetic field would be pointless because, 'the magnets stear it a bit'. This is the whole point of magnetic shielding, and is pretty much exactly what the Earth's magnetic field manages (quite successfully) to do. All the Charged particles get diverted to the poles of the magnet (on Earth, this causes the polar aurorae). Any half-competent spacecraft designer would make sure that they didn't put the crew quarters there. In fact, they could probably do a bit of cunning design and use the magnetic shielding to eject the charged radiation from the reactor along the same axis, cutting down on heavy radiation shielding, since then they'd only really have to worry about gamma radiation.
[1]The academic paper concerning this magnet is here: http://ams.cern.ch/AMS/Talks/AMS_paper_B-Blau.pdf