I didn't watch the game but for a player that was supposedly terrible in the game, he rarely gave the ball away (95% pass completion), won most of his duels, made 4 key passes and created one big chance according to the stats below and he was among the three highest rated players in the Chelsea lineup.Did alright, kept it ticking over, retained possession really well. I think "genuinely terrible" as described above is inaccurate at best.
https://www.sofascore.com/player/marc-cucurella/794939