I've gotten into some bad arguments on this board over this, but I believe Lombardi gets an appropriate amount of credit.
Not all GMing is accomplished in a vacuum of meticulous decision making. Sometimes, you're just lucky. Sometimes, the right amount of circumstances fall into place for you to capitalize. Dean has had quite a few of these instances work tremendously in his favor. Richards and Carter inexplicably being shipped out of Philly. Having B. Schenn at the absolute zenith of his value as a prospect at the same time. Carter not working in Columbus, Gaborik not working in Columbus, Smyth requesting a trade pre-2012, which was not in Dean's plan. A lot of luck has played into the building of this team, as it should have. Gotta be good to be lucky, and vice versa.
I do believe his drafting is fairly overrated, and he's produced some first round stinkers. His decision to hire and then fire TM, followed by universally panned hiring of Sutter paint him as the smartest man in the room.
He's the GM of a team that has won two championships in three years. That's all the credit you need in the end.