Random Crits. What is the purpose and should we keep them?

Recently on one of the servers I admin on a player was constantly complaining about random crits.He's a regular on the server and has asked me and the other admins to have a votecrits plugin on. Me, I want to keep crits on all the time because it's a part of the game, why remove something that the developers intend on keeping as a core part of the game. Now what I want to know is other people's opinions are on random crits, is it necessary to keep it, should it be removed, does it still serve it's purpose in tf2?

What do you guys think?