Marotta was the guy who built that successful Juve team, really. He was in charge until late 2018 then fell out with the board over the signing of Ronaldo and left. Paratici was largely behind the Ronaldo deal, which, while huge commercially kinda destabilised the club and was the catalyst for their fall-off over the following years.I can't say he's been a success at Spurs but he certainly was not at all "dogshit" at Juve. During the time he spent at Juve - from 2010 to 2021 - they won 19 titles, 9 consecutive Seri A titles, and reached the CL final 2 times. And Paratici was vital in building Juve's squad that time. After he left Juve they haven't won any Seri A titles.
Once Paratici took over he signed Ramsay on absolutely absurd wages - one of the worst Juve transfers in history, did that insane dodgy trade deal with Barca where they signed Artur Melo for 80m euros and sold them Pjanic, and just generally screwed them financially since all the money had to go towards Ronaldo's salary. It's no coincidence Juve completely fell off in 20/21 and haven't won a title since.
Paratici was good at Juve at picking out players, making deals, and whatnot (the same stuff he's been good at here). Once you actually put him in charge and have him choose managers & ask him to build a balanced long term squad it all goes to shit.

