The serrated and partially-serrated blades I own are all Spydercos, and I've found them to work quite well for certain things. I generally send them back to the manufacturer when they need sharpening, which means that I rarely carry or use them now.

A well-maintained and sharp plain edge blade does several things better and other things (like cutting thick rope or webbing) nearly as well as a serrated blade, and it's far easier to maintain.