I'm leaning towards the same conclusion -- bored. Nothing is being solved with any satisfaction. Soong as a bad-guy is a snore and honestly makes no sense. Elnor as a hologram shows how dumb it was to kill him off so quickly in the season.
Just as a bit of evidence, my wife has been watching Star Trek with me since 1988, and this was one of the few times we had to pause at several junctures just to figure out between the two of us WTF was going on.
Example: We urgently need to stop the borg queen from taking over the ship. But wait, let's pause for a while to explore your memories about your mother -- even though beyond finding the hidden tunnels, this has nothing to do with the urgency of the current situation. In fact, they kept doing it AFTER they found the tunnel.