Compressor is trying to please both ends of the user spectrum. It has a simplified interface that makes it easy for plug-and-play YouTube presets, etc., however, Compressor is NOT consumer level software. In my opinion Compressor cannot be beat for speed, accuracy, and reliability. Compressor is still the champ by every metric Ive tested. I’ve put it through the paces versus all the usual suspects, and I use it in cojunction with multiple NLEs, not just FCPX...
Compression is both art and science, so you need to be your own judge of the intangibles (i.e. is a given video worth some extra encode time to get flawless results), but I find Compressor to be awesome wether I am banging out small files for online review, batch transcoding, region-formatting, converting framerates, doing high-quality optical flow retiming, or doing a final pass for high-end delivery to a major network.
All I know is this; Compressor, an oft-maligned software, makes BETTER looking encodes with SMALLER final file sizes and generally does it FASTER than the other leading alternatives. If it did not, Id use one of the many other compression softwares that I have access to.