I think the only B5 TV Movie I really rate is ‘In the Beginning’, because it serves a purpose and adds real depth to the story. Thirdspace is strictly okay. As you said, it would have done with being creepier. Also, the ‘kill it with a nuke’ finale was also a tad chliched. It seems like a wasted opportunity to delve deeper into Vorlon history.
I appreciate River of Souls, but only as an unintentional comedy, Martin Sheen hams it up so badly that I just couldn’t stop laughing the first time I saw it. That opening scene just kills me every time.
The less said about LOTR the better. Some of the ideas are fine, but the execution was awful. I don’t buy the excuse that it’s ‘just a pilot’, a pilot needs to be strong than it was to draw people in. It’s a fine example of why B5 didn’t need spin off shows.