I don't have a Mazda 3, but I have a hitch-mounted rack. I have a Thule T2. Loading and unloading is a snap. If you got an after-market receiver hitch (you'd have to get a 2"), you could carry up to four bikes on it.
Pros:
Easy to load and unload
Very stable
You can access your hatch when using it (even when bikes are on the rack).
Cons:
Expensive
Not convenient to take it on and off the car, so it will generally live there forever
Possible rear-end accidents make me sweat



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I'm reminded of why I wanted the Yakima King Pin. We needed room for 3 bikes for our family and it carries 4 bikes (though I could only hold 3 on the Beetle due to weight restrictions). Because of the capability for 4 bikes, it was set up for a 2" hitch. But, since the Beetle didn't accept a hitch with a 2" receiver (weight restrictions), the bike shop swapped out the arm for me (and I removed the hardware that holds the 4th bike on). Thus, the King Pin (4) could do the job of the King Pin (2). (The KP2 may be called something else.)
