Agreed completely. High Sierra was a hot, junky mess, Sierra wasn't that bad but a bit meh, and El Capitan was glitchy somewhat. Mojave has been terrific so far, and pretty much problem-free. The best OS since Yosemite and Tiger, IMO.
Just updated my Late 2013 iMac from Sierra to Mojave on both the internal 5400 HD and the external SSD. So far everything is working great with decent boot up times. No complaints here.