Ok, so the Shadow Within and the Kathryn Drennan book were better than the rest, certainly. But I do find The Shadow Within to be vastly over-rated. Just because it is about Morden and Anna Sheridan doesn't mean its good, though of course that's just my opinion.
In that case, you will probably not like the Technomage trilogy. There, have I sufficiently lowered your expectations? Now, maybe you have a chance of enjoying it.
To Dream in the City of Sorrows was definately the best of the first nine, but it was still nothing special.
I found it to be tedious and dry, for the most part.
And Keyes' telepath trilogy was a bit deeper in terms of characterisation than the rest, but I'm not sure he got Bester's character right.
The Psi Corps trilogy was my least favorite of the three trilogies, with the Centauri trilogy ranking 2nd and the Technomage trilogy, 1st. However, Cavelos still exhibits the annoying habit of bouncing back and forth between two main threads (You feel like a tennis ball after awhile.)
and using one thing
to death. That thing in "The Shadow Within" was the damned archeologist hand callouses thing. In the Technomage trilogy, it was "the scouring" (a Technomage thing). After awhile, you just want to say "Enough, already! I get it! No need to say it sixty billion times!"
The point I am trying to make is that I find overall that the tie-in novels are not as good or imaginative as a lot of original SF. B5 aimed to be the best SF TV show and it was, and I know JMS wanted the novels to be the same. Only Peter David's trilogy met my expectations in terms of characterisation, Londo and G'Kar's death was very emotional.
JMS is probably the only person on Earth who can write for Bester, and JMS is too busy and distracted to do so. I think the problem is that top authors look upon tie-in novels as being "beneath them." They're not going to want to write somebody else's story. They want to write
their story.
They're just my opinions. Those two books that you mentioned aren't terrible, but personally I don't find them very memorable in the long run.
Of all of the books, I find The Technomage trilogy and the Centauri trilogy the most memorable. Before
A Call to Arms,
Crusade and the Technomage trilogy, the technomages were a sketchy footnote. Now, to me, they're one of the most interesting parts of the B5 universe, and something I'd love to see continued.