This episode's often called the best of Season 10. I'd also already had high hopes of Darin Morgan. The episode lived up to expectations.
It's a comedy, making fun of... well, of some of the show's most basic assumptions, but also of other things too. Guy Mann is awesome. Analysing the episode would be a thankless job, because the episode's beaten me to it and said it all already, but funnier than I'd have managed. "I'm looking for internal logic." "Without a job, I'd never get a loan and start a mortgage... whatever that is."
Incidentally, the actor (Rhys Darby) is a New Zealand comedian who likes ad-libbing. Here, though... "His writing was perfect. I couldn't deviate off the tracks. Normally, as a comic actor, I like to improvise and try and make things funnier than they are on paper. But there was no improvement I could make."
Mulder's almost as crucial. He's the foundation. The comedy's built on him. Darin Morgan's always found him funny, ever since Humbug. Here, he has the conspiracy theorist's equivalent of a mid-life crisis, then becomes the comedic foil for Guy Mann and a deadpan eccentric in a world that's even dodgier than he is. Watch the cemetery scene, for instance. He also chases a monster with a camera and gets to subvert a standard X-Files trope by saying all of Scully's dialogue too, because even he knows the pattern so well.
There's a motif of unconventional and/or socially unacceptable people, e.g. the paint huffers, the peeping tom who prefers Mulder and the transvestite crack whore. This is funny, but Guy Mann's part of it too. That's arguably true of even Mulder himself, in his tinfoil hat way. It's just that Mulder's currently questioning his hat choices.
(It's a good Scully episode too. She got more of the spotlight last week, but here Anderson's having more fun.)
This is the kind of episode where you start discussing it, but then grind to a halt because you just want to start quoting it. The plot fits together with deceptively careful neatness, but with gags.
"Mulder, the Internet is not good for you."