Well, I didn't address the changing identity of TOS, and yes, YMMV. However, TOS dealt with more turmoil, with numerous turnovers of production staff, including (what we would call today) the showrunner, and changing relationships with the network. Enterprise had a number of similar challenges the network changed hands, the producers were edged out), but managed to become more focused ).SNW mirrored TOS in that is was EXCELLENT out of the gate (unlike the Berman Era Trek series - they all sucked in gtheir early seasons.)
Also, sorry, but I don't see any quality drop and there are more good to excellent episodes than clunkers for me - so far I've only disliked S3 Ep. 2 and S3 Ep. 4 - the rest have been good to excellent.
VMMV of course.