There are some reasons for chosing OpenBSD, and it does make a quite capable desktop. It still lacks the "just works" approach of Linux distributions like Mint, and the performance of lean distros like Debian.

That being said, OpenBSD has an excellent installer, amazing docs, and I did run it as a desktop for a while. Went back to Linux because I wanted to play Dwarf Fortress natively of all things. Things don't neccesarily work better with Linux, but I definitely spend less time tinkering now. Which could be a good or a bad thing depending on whom you ask.