That's some revisionist theory. Schafer was a top 20 prospect heading into 2008. Quibble about his actual talent level all you want. He was considered a great prospect in 2008. Heyward was also a top 50 prospect. And Lillibridge and Jones were Top 100. That's four top 100 prospects that he himself inherited, not to mention a bevy of other talented kids on their way up. The cupboard was not bare, no matter how you want to spin it. In fact, BA ranked us 8th pre-season 2008 among farm systems.
And the on-field talent he inherited included Mac, Tex, Escobar, Renteria, Chipper, KJ, Hudson, Gonzalez, and Soriano, plus some decent role player guys like Prado (at the time a role player), Frenchy, and Blanco . Not the 27 Yankees, but enough of a core to build a winner, paired with a good farm and some savvy FA signings. And to Wren's credit, he did build a winner with that
Wren made some good value trades, though several of them didn't work out as intended. McLouth was lauded at the time as a great value trade, but he quickly busted. Uggla trade, again, was lauded for the value, but he quickly became a liability, while Infante would go on to roughly double Uggla's WAR over the same time frame as Uggla's contract. But I won't fault him for Uggla, as it certainly seemed like a steal at the time. Vazquez, Upton, JJ, and Bourn were all great trades that worked out. I have a hard time giving him credit for the Kotchman/LaRoche swap being that he's the one that traded away Tex for Kotchman in the 1st place. And the Angels used the Tex comp pick to draft some player named Trout.
Let's also remember that Wren gave up a 1st round pick to sign a 41 year old Tom Glavine that had just posted a 4.4 ERA the year prior. I think this gets overlooked, but it's one of the 5 worst moves of the Wren era for me.
Also, I don't recall anyone thinking the Upton contract was "fair." I recall most thinking Bourn would end up with the higher contract given he had been the more valuable player. Upton represented the highest FA contract we had ever given out (still is).
I'm not trying to make Wren out to be worse than Coppy. He wasn't. But Wren certainly drafted worse than Coppy and left the farm far worse than when he arrived, with not much hope of competing past 2015 when J-Up and Heyward were heading out of town. It was time to tear it down and considering Wren's failure's at building the farm, I feel confident in saying he was not a good choice moving forward.
Conversely, Coppy the left the major league team far worse than when he arrived, but managed to rebuild the farm. Again, it's debatable whether someone else could have done a better job with the resources available to trade away and the high draft picks we had, but we have to go by the result we have (which is good overall). But his impatience on letting the rebuild take it's course naturally ended up with 2 truly horrific trades and a 3rd one that was nearly as bad. And the rules breaking thing was totes bad too.