I'm on Ubuntu 14.04 and had to stop to check if systemd is installed, it is. Ubuntu operates the same for me today as 12 did. I don't have any issues with it. I wrote a Java system service the other day and installed it with the usual update-rc.d command like I've done in 12 and it runs fine so for me systemd has nothing to do with my choice to stay with Linux, Ubuntu specifically. It certainly wouldn't drive me away, I wasn't aware it was even there. Like Ubuntu, and Linux overall...it just works (apparently).