He's picked
3 out of 15, it's a little early to be so confident about your opinion. Or that he'll run a Cabinet based government vs. e.g. something more in the direction of what Obama did. Or that he won't "fire fast" if they don't perform or fulfill whatever promises he made to them, as Chris Christie found out. This is, after all, the guy who won the election
because he went through 3 campaign managers, not despite it.
And Sessions may be a "dyed-in-the-wool Republican insider", more specifically a de jure member of the establishment, but his positions on immigration put him well outside of the de facto establishment.
I'd never even heard of Wilbur Ross before he was picked, he's not a notable "dyed-in-the-wool Republican insider", in fact, being "a trustee of the Brookings Institution" (https://www.washingtonpost.com/news/powerpost/wp/2016/11/24/...) makes him anything but that. Heck, per Wikipedia (https://en.wikipedia.org/wiki/Wilbur_Ross#Political_activiti...):
Ross served under U.S. President Bill Clinton on the board of the U.S.-Russia Investment Fund, and later, under New York City Mayor Rudy Giuliani as the Mayor's privatization advisor. In January 1998 he put $2.25 million in seed money into McCaughey Ross's campaign.[citation needed, and I add she is a Republican, but obviously of the NY variety] Although he was an early supporter of Donald J. Trump's presidential campaign, Ross in earlier years was a registered Democrat, served as an officer of the New York State Democratic Party and held fundraisers for Democratic candidates at his apartment in New York City.
It is absolutely, totally, and completely wrong to claim he is a "dyed-in-the-wool Republican insider".
His Education Secretary pick is a Common Core fan, that's enough for me (as in, not in a good way at all), but see my other comment about the current state of US K-12 public education. On the other hand, she seems best known for pushing private school vouchers (another bad idea, he who pays the piper picks the tune), but that's definitely not a partisan issue, plenty of Democrats are for it.