Here are my thoughts about the game...
Not much to say on the first half, we were in control and played fairly well. We didn't create enough, and as i see it there were several causes adding to this. First, Lazios 3-5-2 really crowds the area in the middle of and in front of the box, so you need to be able to take advantage of the extra space on the wings, outnumbering their backs due to their lack of wingers to support. And having both Asamoah and Lichtsteiner playing, combined with Mandzukic who adds different things from a classic winger (and thus functions very well with a back who is strong in going forward, e.g. Alex Sandro) and a Douglas Costa who produces to little ment we did not create enough.
Second, and this amplifies the first point, we struggle with creating the play on midfield. Missing Pjanic is costly, his importance has risen after the sale of Bonucci. Really, we depend on our three main attacking outlets in setting the play, knitting it all together - Dybala, Pjanic and Alex Sandro. Missing all three ment the game was to slow and predictable. Bentancur is promising and played fairly well in the first half, but he is not really Pjanic-type of player, which became evident when he was paired with only Matuidi in a two man midfield, that does not create much and thus put a lot of responsibility on Dybala and the wings in setting the plays. Also, Bentancur is so young, and it is a lot to ask. When he got tired during the second half he started making lots of mistakes. Still, we creating a few chances and gave away very little, looking much in control in the first half.
Khedira was also solid in the first half, i am impressed with what he brings to our game. But he was not fit and it really showed close to his substitution. The midfield must really give Allegri some headaches, there is no room to alter the setup, since he just have to field whoever is fit at the moment.
You have to compliment Lazio for some really neat and dangerous counter attacks in the second half. They are underrated, probably lacks depth, but has a strong core and a competent coach. It is a shame we allow more space than usual, because they had the quality to make us pay for it. What i am most dissapointed about was how bad we were on the ball in the second half. Lazio clearly closed down the middle of the field, gave Higuain (and Dybala when he came on) and our wings little space when receiving the ball. That ment more space for Asamoah, Lichtsteiner and our central defense, who were forced to start plays. Clearly Lazio were fine with that. Not having Bonucci anymore means we need to have more playmaking from the wings and from Pjanic (or whoever plays in his position) and/or Dybala.
Higuain was really bad today. This is the first time i have been worried, because even if he didn't look really sharp so far this season, i think he added to our game by decent link up, intelligent runs, creating space for Dybala and the wings. Today everything he tried went wrong. Bad first touches, some bad decisions, a missed big chance. You have to tip your hat for his eagernes and the work he puts in to try and get back in. Almost gave us a goal from hard work, but off course it had to bounce off the crossbar. Look at the killer-instinct Insigne (just scored) and Mertens show at the moment in Napoli. Higuain used to have that, i hope he will find form soon. We need it badly.
I see a lot of complaints about substitutes. I struggle to see what Allegri should have done differently, if we assume Dybala, Alex Sandro and Cuadrado were tired from travelling (Bentancur showed signs of it in the second half). He had to sub off Khedira and thus had no choice but to let Bentancur play the full game (unless we should play a midfield of Matuidi and Sturaro... no, right?).
Subbing off DC was a fine decision and it seemed obvious to play Bernardeschi instead of a tired Cuadrado. If people are pissed about him using his last sub on right back when down by a goal, i just have to point out, that if Lichtsteiner was running out of gas, and with Lazio running soem fast and dangerous counters down that flank, leaving our right back exposed in 1 vs 1's against SMS or Alberto/Nani, you can argue that it was a necessity, even if it didn't add anything to our game going forward. Getting down 3-1 would have killed the game, but as long as it was 2-1 we were in it (though it looked like we could have played and extra half without scoring, sadly).
Maybe Dybala should have been brought earlier? Hard to say, really. Looking at how many difficulties he has with getting into the game, i am not sure 5 or 10 minutes would have changed much. Such a shame he missed that penalty, badly executed.
Allegri has a task of integrating DC and Bernardeschi, such things take time, but we are too dependent on the "five stars" (just as last season) until the new guys start adding more output to their game. It puts pressure on us that we lose a home game, now we probably need to get some wins in some difficult away games. But hey, games are sometimes lost, a shame it had to be like this, but going two years unbeaten at home is pretty impressive. Now on to a super important CL game, and then we have to must wins before a difficult away game at San Siro. The league will be entertaining this year.