They’re bad because they’re rusty and not game ready under Woody because he didn’t play them enough during preseason.
They were bad under Tippett because his systems were bad, but at least the players weren’t rusty to start the season because he would play them 5 or 6 times in the preseason.
Both coaches have negatively impacted their team in different ways.
They were bad under Tippett as much for their deep sustained injuries to their 1A platoon goaltender and injuries deep into their d-corp and McDavid/Draisaitl hitting a hard slump which negatively effected a team still growing its forward depth. The sustained under performing to expected goals finally reset itself with timed with a confluence of factors, getting Kane; return of 1A goaltender and other injured bodies; and resetting new voice under Woodcroft. It was not a binary reality of Tippett bad; Woodcroft good. Lots of contributing factors.
What I perceive as a perceived Woodcroft strength of roster deployment has actually been part of the problem early. The line blender after game 1 made no sense going into 'The Rival' game 2. This was a hangover effect from the Colorado series where he blinked after a hard fought game 1 and reset his top lines. Not helping the cause of settling this team down. Smaller quibbles from my pov the primary issue remains within the players and their decision making and compete level in the battle areas on ice.
Woodcroft has the best lineup this franchise has fielded since Chiarelli took a woodchipper to its depth. Healthy to start the season and hungry by all accounts to win (so we've been told by players, coaches and management). It's only three games into the season. However Woodcroft hasn't seemed to get the message across with the poor decision making and soft play continuing after the Flamers game. All repeating issues that go back and continue to repeat themselves. The required change has to come from within the players and needs to stick, not be fleetingly and frustratingly carried out as its been through 3 home games.
EDIT: Let's be clear, I like Woodcroft a lot and feel he's earned this opportunity. He can become a really good NHL coach but he's also not a miracle worker.