I haven't read any opinions yet. My initial thoughts:
Well, that was ... kind of fun, in a throw-everything-at-us-to-keep-us-from-stopping-and thinking kind of way. Plotholes? What plotholes? Also, point-, brain- and soulless.
At one point, when most of the heroes were in the tardis and the Doctors gave their instructions, that scene only confirmed for me that at least half of them were superfluous. I liked Vinder, Bel and Di, but I don't care for them. No offense to the actors, they were fine. Almost like a backdoor pilot for a new show.. So I cracked up when Bel, Vinder and Carvinista took off together. Who knows, RTD has been known to want a Marvel-esque Whoniverse. It would suck for me, personally, if they used Jodie's last season for that.
Same with the villains, I could have done without the Grand Serpent at the very least.
Oh, and Chibbers, please stop with the queerbaiting, it sucks.
So Carvinista was once a companion, but still tried to kill the Doctor several times? Those abandonment issues must run deep. Poor puppy.
Somehwere, buried beneath all the mindless plot and crcumstance of Flux, there was a great show (that could have been made). But hey, you got too much setup and not enough time? Just triple your protagonist! (Admittedly, that was a neat idea.)
Loved Jericho's performance.
Oh well. I will miss Jodie (after the specials). The showrunner, not so much.
tl;dr: It could have been far worse, I guess.
ETA: I must agree I'd rather seen Jericho as the new companion than Dan. No offense to Bishop.
Not sure if I feel generous enough for a 7, maybe I'll rewatch.