I never play without one 3. Its good to have a metronome to count off the tunes, that way the tune will always start the same every night. Webster's definition 1. Rhythm as determined by the grouping of beats into measure 2. Tempo Herman's definition 1.
Good time is the memorization of space.
Good time is something everyone should have, not just the drummer. Good time is not necessarily good meter. You've got to move and breath with the band. Time is more than just the name of a magazine. Time is more than just a name of some lil' old square in New York City.