How can one tell which ceiling fans are reliable?
For the wobble, for various reasons almost all fans will "wobble" with time.  As with anything that spins they need to be balanced.  Fans require maintenance, and the manual should tell you when and how to do this maintenance.  This involves making sure all screws/bolts are tight, and in the case of wobble it will tell you how to balance the fan.  Fans come with shims and instructions on how to balance the blades.