Really poor showing, both in terms of attitude and organisation.
This game showed a lot of the weaknesses of 3-5-2 I've been banging on about.
3-5-2 against one striker systems is always awkward and you need clear plans on how the spare CB is going to play and Juve didn't seem to have that.
It also wasn't clear what Juve wanted the wingbacks to do defensively, either. The were often left in wide areas basically marking no-one while Juve were being overwhelmed in more central areas.
I hadn't watched Shakhtar for a while before this game, so I don't know if that is there normal pattern of play or if Juve were caught out by them doing something different. I guess that was Shakhtar's normal way of playing, though, which means Conte got the tactics wrong or the players didn't follow the instructions.
I'm also not sure to what extent Juve wanted Shakhtar to have the ball. It is entirely possible Juve were happy for them to have possession, but Juve - accustomed to dominating possession - were then terribly hasty in possession themselves and were not the threat on the break that they ought to have been.
There are games in Serie A where Juve are able to mask a lot of failings by being far more athletic then their opponent, but they couldn't do that against Shakhtar, which is something they are going to have to get used to in the CL.
They've a lot to figure out before the game in Ukraine and not winning last night means they'll almost certainly need to get something out of that game.