No way! That's what sudo is for. Even if it means "sudo su -" to become root after logging in rather than running a command as root. I always disable sshd from allowing root to login as one of the very first actions I take on a new box. (if it's not already) The most common brute force login attempts are made against use root. I run denyhosts to block any IP that attempts to login with root on the first attempt also. Also, never use david, bob, jim, or whatever else as a username. Those are the second most common brute force attacks. First initial last name is far safer because there are infanitely more combinations that a brute force hacker would have to try on top of all the password attempts.