There are a bunch in a row early in the season that are fairly good, the recreation of starfleet academy, the one where Neelix tries to distract Naomi while her mom is missing, and the one where Harry sends a message back through time. After that I think there are only a few more good ones, the one with the think tank and the one with the time ship from the future.
The one with the warhead is a really interesting concept, but it does drag on a bit, not quite enough story there for an entire episode.
And I guess the one with the generational ship that needs repairs was interesting as well.
The one where Tom gets demoted for trying to save that ocean in space was almost good, but as much as they tried to make it compelling it did suffer from the blandness you mention.