A group - City - PSG will be hot, but Leipzig is also capable to fight.
B group - Probably most ballanced group. Liverpool and Atletico are favorites probably, but Miland and Porto is also powerful.
C group - 3 similar level teams and obvious underdog Besiktas
D group - almost same group like last year, just Gladbach replaced by Sheriff. I hope it will be same interesting like last season
E group - as Barca fan I fear of Bayern, but I think we are capable to beat Benfica and Dynamo at least.
F group - repeat of last Europa league final, plus Atalanta. But I think it's not bad group for MU.
G group - is it Europa league or what? This group looks most difficult to predict.
H group - easy life for Chelsea and Juventus.
Groups A, D, E look quite good, definitely good groups, specially group A, that seems like the best group to watch. Groups C and G do not look that tempting, they could have been a europa cup group all we know and it wouldn't really be that weird, group F is literally europa cup finalists 50% so that is kind of like that as well but they grew so much larger in the span of 2 seasons so that is normal to see them there, plus a rematch for Man United team as well to beat them, maybe even twice, still wouldn't be as good as getting that cup but at least a revenge chance is a good thing.
Long story short it is a good group draw, I think it is going to be fun, too many games all at once coming in very soon for the football world, we are getting close to that period where teams have league games, cup games, and European games all back to back constantly giving us so many games to bet on.