How the hell they can plausibly introduce the Borg is beyond me. The Borg were unknown in Kirk's time, and even in Picard's time, the Enterprise had to be hurled beyond known space to encounter them. At the time, the Borg had apparently never heard of humanity.

Continuity has not been Star Trek's long suit.

A whole bunch of stuff from the original series was completely ignored. Heck, Kirk ran across a race of hyperadvanced non-corporeal energy beings about every other episode, but in Picard's time, we've just got Q. Whatever happened to the famous Organian Treaty?

Ack. Don't get me started.