The Catwalk is one of my top ten favorite episodes of Enterprise. I'm not even sure I can articulate why it's my favorite, since it encompasses everything from good camera work, cool angles and perspectives, a real sense of community, great characters, a good story, humor, mystery, suspense ... and great blooper reel moments. This is one of those episodes I can just pop in anytime and watch again and again and again.
First of all, I love the homages to M.A.S.H. throughout this thing. It had the feeling of a bug-out, and the poker games with the food ration packs were just AWESOME. There was even the mess-tent movie night moment. Love, love, loved it.
I've always enjoyed shipwreck and doomsday stories, where the heroes have to make-do and create a livable situation out of duct tape and coconuts. (Yes, yes, I loved me some Gilligan's Island too.) So the need to turn a space that was not intended to house 80+ people and a dog was really neat. Seeing Phlox try to pack up all of sickbay ... you don't realize how much is stored away until you have to move it all. I've done that way too many times in my life. I thought it was a nice touch to have Phlox say he was unaccustomed to making emotional appeals to a Vulcan, and have T'Pol react with more sympathy than some humans would. AND he was doing this for his critters ... so much for the idea that Denobulans don't keep pets.

He grew attached to all his creatures!
The wave front itself was beautiful - as storms often are. Deadly they may be, but they can be artworks of nature to look at from space. That was a nice line that Archer had about not expecting it to be beautiful. There was also so much unspoken between-the-lines stuff going on in his conversation with T'Pol. Despite her protestations that she was not good at fraternizing with the crew, she knew exactly what to say and what NOT to say to them. And she figured out the plot of the movie.

It was just adorable all the way around.
The aliens for this episode were also great. They were believable as conscientious deserters and in what little we learn from them, it sounds like a fascinating and complex culture, worth revisting. I particularly liked the way the scene where they reveal the truth was staged. And then Archer, T'Pol, Trip and Malcolm walking and talking ...
Yeah, I could keep going. Suffice it to say it's definitely one of my favorite episodes - for every single moment of it. Well done.