You’re probably sick of hearing it by now. We’re sorry about that. But we’re only thinking of your well-being when we say it: you really ought to be watching The Wire. The stunningly complex and believable series about Baltimore’s drug trade and pervasive institutional decay is only a couple of weeks into its fourth season on HBO, but the plaudits are already here in force. A 98 out of 100 on metacritic should provide some…