I have been very happy with the R134a system in my truck. Even with black paint, the A/C gets the inside cool very quickly. It has never been recharged or anything and it still works great after 7 years. The rear windows have factory tint and the interior is relatively small compared to most other vehicles, so I'm sure that helps a lot. Some of the A/C components are probably shared with the '95-'01 Explorer as well, so they may be overpowered for a Ranger.
The worst A/C I have come across in a newer car is in the Mazda 3. My mom and sister both own 3s and those cars take forever to cool down. The lowest fan speed is pretty useless, and the black interiors absorb a lot of heat. They are great cars in every other way, but the A/C could be a lot better.