How is $12M/5 a big commitment? $2.4M AAV is a cheap coach, I have no idea what glass house you're talking about
Mike Babcock is the only active coach in the NHL with a contract longer than 5 years (and even his deal, which completely shattered the NHL coaching salary paradigm, only has 5 years remaining).
At $2.4M, Quinn's contract is also more than AV's previous contract with the Rangers ($2M), and Quinn has (without a doubt) demonstrated less at the NHL level than AV had at the time his contract was signed.
At $2.4M, Quinn's contract puts him only $225K per year behind Bruce Boudreau (second among active coaches in Pts% and has coached his team to a 100+ pt season/pace in 10 out of 12 years in the NHL).
At $2.4M, Quinn's contract puts him $400K ahead of Peter Laviolette's salary for this season. Laviolette just signed a new deal that's likely more (but only has two more years of term).
At $2,4, Quinn's contract puts him $150K ahead of Jon Cooper's salary for this season. Cooper just signed a new "multi-year" deal that's likely more.
You guys went out and spent big to get your preferred coaching candidate, regarding of whether or not he had earned that contract. The Rangers paid Quinn more than some of the best coaches in the NHL, and committing 5 years to a coach is something that's typically reserved for top level coaches in the NHL, not NCAA rookies. That's the glass house.