I was between 7.5 and 8. Gave an 8. We made our attack awesome (not good, but awesome) and made the best defence in the world even more complete.
But, our midfield is worrying. Slightly worse than last year. Essentially, we replaced Pogba with Pjanic (a downgrade, but not a very big one) and Pereyra with Asamoah (would call it an upgrade, but Asa is still a question mark although he looks to be over the injuries). Additionally, Marchisio is injured (which no matter how good the recovering goes, is an ongoing project) and Hernanes clearly knows that he's unwanted (maybe it affects the pressure on him). A decent complete midfielder like Witsel (technically sound, complete, brings physicality, in a good and mature age with a good injury status) would made me so much more assured about a potential emergency situation. I think he would fit very nicely in our midfield.
So, we upgraded greatly our attack and defence with players on their peak, a statement for CL, while we left a question mark (not a hole but a question mark) in the centre of the pitch. That's why its a 7.5-8. In a year you go all in for the CL, you don't want question marks in the team.
If we had got Witsel, it would have been a 8.5-9 (would have improved all our lines, yes I consider Pjanic + Witsel + healthy Asa better than Pogba). If we had kept Pogba, a clear 10 (we would have greatly improved every single part of our team).