Don't like putting words in people's mouths, but I think it's about the general backdrop. Back in the days of numbered novels, it was mostly adventure-of-the-week within or on the frontiers of the peaceful federation.
Now it's against the backdrop of the aftermath of the dominion war, the borg attacks and the andorian secession et al, and the outcomes are often not definitive victories. Not saying this is a bad thing, but I have noted the difference myself.
Yes, this is what I am talking about. Now Chris you may not see it, but this is something that a lot of fans have seen. Again, I did not say it was bad, but I am looking for a little bit more light. So let's get Janeway back