Most of the revolver issues arent something on the gun breaking, its usually ammo and/or maintenance related. All it takes is for a round to jump a crimp, or a squib into the forcing cone, or crap under the extractor star from improper loading, etc, and youre done. If youve been shooting a revolver any length of time, youve probably encountered most of those too at some point. I shoot a bunch of different revolvers all the time, and they are not the super reliable guns you often hear thrown around, and can be a real PITA when things go south if you arent prepared for it. Certainly not something Id want to be dealing with in a gunfight.
Autos issues are usually ammo-related as well, for the most part, and arent usually a big deal, unless you get a squib. A quick TRB will have you back up and running in under a second or two.
Other than dealing with others "improvements" on used guns Ive bought, even with high round count guns, the autos are normally very reliable with good ammo, if youre buying reasonable quality stuff. The first part I ever broke on the one Glock I shoot every week in practice was a trigger return spring that went at 90K. I had another go at 120K, and eventually broke a rail at just shy of 150K. The gun was actually still functional too with things broken.