Not to defend Taylor, Maguire or Potter too much, but...
Each of them came in on top of a semi-rebuild of the previous coach. This left them all with the remenents of a missed project started by someone else & were given very limited time & resources to turn the whole thing around.
Taylor in particular walked in with very, very limited cash resources & recruited accordingly. Maguire walked in with half his salary cap tied up in Cleary purchases. Potter was handed the remains of the beginning of a new Sheens rebuild.
While they all 'failed' in their respective ways, I'm reasonably confident that given the right time, power & resources, all of them could have turned things around.
Tim Sheens has stepped in with the Tigers now in a position were there are few lingering contracts that weigh the club down & his task is to, hand in hand with the next coach in Benji, ensure that the squad Marshall is handed is ready to BE Benji's squad- not a rebuild.
Think of it what you will, but this might just be the way to transition in the future, instead of throwing rookie coaches into the fire to fix the last guy's problems.