Only person to be annoyed with is the tank. When he left it became abundantly clear to anyone else coming in with the group right at the start and no tank that they'd be sitting there for quite awhile not even playing the game waiting for a tank to come in.
Generally if a tank drops on a 4-man, unless you're already quite a ways through it, it's faster to just cut your loses and follow him out and then requeue while doing other things.
