I think one big reason why I found our game yesterday very entertaining yesterday (unlike others) was partially because I was intrigued and trying to understand our tactical setup.
I've just re-watched the 1st 60mins and in a good way, my brain still hurts trying to figure out our attacking fluidity especially when in the opponent's half. I see some basic rules in the backline - for example having 3 men when the ball's close to the halfway line (3-1-6 at times), and 2 on the halfway line when we've reached the final 3rd - this sometimes triggers a bombing run by the DM or fullback.
When building up from the back we seem to play a 3-4-3 or a 3-6-1 with Casemiro occasionally dropping deep to create that 3, although there are times our left-back is the one playing in the middle of the 3 (Dalot / Licha). When we want to play a fast break from the back it's more often a 3-4-3 with our wingers staying high and wide (especially Rashford) and the CF dropping slightly deeper.
However I'm still not quite understanding the interplay among the front 6. It seems fluid with the players are given a lot of freedom, but I reckon that there's are methods to the madness. For example, always creating triangles around the ball carrier..
In the 1st phase of defence we are committed to pressing high up the pitch with a 4-0-2-4 setup which at times end up as a 4-0-6 because of how deep the opponent's midfielders drop back. Maguire was useful in winning headers when Fulham decided to lump the ball forward. It remains to be seen if a better team like Brighton will be able to simply bypass our press and leave us stranded. For that reason I wouldn't be surprised if Maguire's dropped for De Ligt, who should be able to defend much more aggressively especially in 1v1 situations higher up the pitch. Also, we definitely aren't defending in a rigid 4-4-2 in our half.
Edit: Anyway, even though we're supposedly a 4-2-2-2 team, it's the shape I saw the least during the match, especially since our high press is more like a 4-2-4 or 4-0-6, and we certainly do not build up with that formation. Anyone who claims that this season's system remains the same or even largely unchanged is talking out of their arse.