Revolvers
limited magazine capacity
heavier than most autos
larger in overall dimensions than autos
As many parts as most autos and more parts than some autos
Most parts require a gunsmith to install, no "drop in" capability
Increased recoil due to magnum cartridges
long and heavy double action triggers
Many moving parts when trigger is pulled
No manual safety
No "out of ammo" indicator
Many revolvers have integral rear sights.
Many revolvers have no option for night sights
Cylinder gap blast can be quite severe
Timing issues
Blown primers cause firearm to fail indefinitely
Aligning six rounds with six holes requires fine motor skills and more effort than aligning one large magazine with one large hole
Cannot execute tactical reloads(top ups) with speed loaders.
Cannot execute tactical or emergency reloads without rendering the firearm useless
Partial reloads(less than full cylinder) can result in dropping the hammer on several empty chambers before the live rounds.
Cylinder gap blast destroys the top strap, eventually rendering the firearm unsafe
No ability to mount a light
Slower reloads
Failure for any ONE casing to fall from the cylinder renders a speed loader useless until all chambers are cleared.
Spare ammo(speed loaders) take up more real estate than magazines with fewer rounds
unable to surpress a revolver
Ejector rods back off causing the cylinder to lock up
Excessive firing and heat build up cause empty cases to stick in the cylinder
Excessive firing creates large deposits of carbon on and in the cylinder
High bore axis and magnum calibres combine to form a turning moment, increased muzzle flip.
Open action prone to debris
Slow follow up shots
Difficult to operate one handed
As far as accuracy goes. A single action trigger is a nice advantage for precision shooting. From a practical stand point, the revolver shooter will never #### the hammer when using the firearm in a high stress situation. Sight radius is neither critical nor required for accurate fire out to and including 25 yards. Proper training and practice can hone a persons ability to shoot naturally, also known as instinct or point shooting to the point where sights are neither needed nor depended on. The length of a handguns sight radius varies so little from handgun to handgun that the difference is a non issue. handguns are designed for close range and usually sport large chunky sights which reflect their intended usage. They're handy/convenient, and quick to bare. They are not precision instruments from a traditional precision stand point. As for operation, the slide does not begin its movement until AFTER the projectile has left the barrel. Slide movement as a cause for "inaccuracy" is usually a result of poor sight picture or operator error.
http://video.google.ca/videoplay?docid=834173228792370974
Some other points. Barrels and their lengths can be changed on a revolver, at the cost of other attributes. Namely weight and handling characteristics. Barrel length has very little to do with accuracy. Velocity is the key. An increase in barrel length can increase velocities which results in more consistent accuracy over greater distances. Again, handguns are designed for short range work, making an increase in velocity/accuracy of little gain. Even with an increase in velocity with a longer barrel, revolvers are still wasting much of their potential gain due to the cylinder gap.
Revolvers have 6(or more) open chambers for which debris can enter and cause problems. A plugged chamber could very well cause the revolver to detonate on firing. For most autos the only access points are the mag well and the muzzle. Beretta being one of the exceptions with its open slide design.
Revolvers are not necessarily easier to train novices on. Both autos and revolvers require three movements to operate. Insert magazine/shells, Cycle the slide/close the cylinder, pull the trigger. Many autos have manual safeties which may require operation. Revolvers require the shooter to mind the cylinder gap so as not to get burnt or get a gas cut. Other than crossing ones thumbs, the slide will not damage the shooter if they run their fingers against the slide during firing. With rapid heat build up on revolvers from sustained firing, the shooter must make contact with a potentially hot cylinder. This is not required by those who shoot autos. The slide does not heat up as rapidly, nor does it achieve the high temps a revolver can. Should the auto get extremely hot, the slide release can be used as an alternative.
There's probably some more points I've missed but I'm sure you get the idea. Most military's and LE agencies issue autos. The domination of autos over revolvers in both of these areas was not achieved by the offering of cheaper firearms or inferior firearms.
TDC