Quenneville's idea of working "hard" in the O zone is often to send all three forwards below the goal line (he probably calls it "outman" the opposition), while having the two D-men park at the blueline. Sure, the forwards dig the puck out more often than not (provided if Captain Intangibles doesn't trip/fall or get knocked down these days), but only to be intercepted by the other team's three forwards waiting comfortably in the vast gap from the goal line to the blue line. Upshot: 3-2 odd-man rush going the other way.
In the D zone, again, Quenneville routinely sends 3 or 4 (in any combination of forwards and D-men) to the general vicinity of the opposing puck-carrier. This usually ends up in two ways: EITHER they get the puck and make a weak clearing attempt off the boards (or an attemped pass, to nobody in particular, since every teammate is so down low), to be easily picked off by an opposing D-man near the blueline, OR they somehow let the opposing forward(s) make a quick pass or two right to a wide open shooter sitting in the high-danger scoring areas. Even if there were D-men left in front of our goalie, they're usually not [in position to be] checking anybody. Rather, they often just wave the stick futilely at the puck (and miss), or attempt some half-assed shot block (and fail), which instead end up serving as gratuitous screen for the shooter (cough Seabrook cough) or puck redirecting pylon (pre-trade Hammer).
The two dysfunctional halves must have been working out beautifully in practice, 5-on-5 or PP, but not against most opponents playing a well-structured team game. It's painful to watch.
P.S.: I never get why Quenneville tolerate or have forwards like #19 doing the fly-by "checking", i.e., doing a quick U-turn behind the opponent's net, casually slapping the stick at the puck-carrying D-man's stick (or maybe it's at the puck...) which is easily dodged via a quick pass to a teammate skating up ice near the blueline, and all of a sudden #19 (and typically another linemate in nomansland in the O zone) are way behind the odd-man rush. Conversely, when the other teams do it, #2 seems especially susceptible to being forced to cycle and turn back and drop pass.