That's hilarious. OEMs do have a tendency to install the cheapest hardware ever, though. Back in the day, Apple used to install NMB or Nidec fans in their systems, and you'd be hard-pressed to kill one of those.
Anyway, the first thing I do with buzzing/vibrating fans is clean them, then oil them. 90% of the time, oiling them up will return them to like-new operational status, which is especially helpful when faced with a dying proprietary, funky-shaped specially-designed shit fan. The only time this doesn't work, really, is when the fan has been run so long without proper lubrication that it seizes and/or destroys the bearings.