The advantages of horses over cars:

* Ultimate all-terrain vehicle.  Horses go where hummers fear to tread.  
* Constant supply of fertilizer for your garden
* Safe to ride while you're drunk
** ''uh, actually folks have been busted for driving a team while drunk. They tried to tell the court, "but the horses weren't drunk!" It didn't fly...''
* You can talk to your horse without people looking at you like you're crazy.
* You can thumb your nose at OPEC.  (So far, OHEC--the Organization of Hay Exporting Countries, has yet to ramp up the price of hay...)
* With careful planning, a horse can generate its own replacement. Try that with a car.


Disadvantages:

* Horses can't go 80MPH (130km/h) no matter how hard you ride 'em.  ''PrematureOptimization''
* Hard to put a clever bumpersticker on the back of a horse.
* No place to put a set of clubs
** Aw, use your imagination!  You can ride a horse ''and'' juggle at the same time.  Try ''that'' in a car!
* No place to plug in your laptop--no place for a passenger to ''put'' a laptop, for that matter.
** There is a place to plug in your laptop, but the horse won't like it very much.
* The HorseCarImpedanceMismatch makes it hard to use horses in a car-dominated infrastructure.
* Horses don't like being tied to parking meters
* They shit everywhere

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Inappropriate comparison.  Culturally and logistically, the role of the horse has been supplanted by the motorcycle--right down to the independent, "bad boy" image associated with its rider. The horse-drawn carriage is what was replaced by the automobile, just as the farm wagon was replaced by the pickup truck.
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Has the transportation theme on Wiki now officially jumped the shark?  

ObjectiveAdvantagesOfJumpingTheShark