VG did not write Clyde Bruckman. That's DM, who is involved in the revival and is writing AND directing one of the six episodes. DM is an even more important writer on this show (if not necessarily in popular television history) than VG. It is unknown whether DM still has "it," but when he did, the results were far more consistently brilliant than VG's solid XF work.

Pusher is good but it's basically a superhero thriller with stock archetypes into which Mulder and his supervillain evil double have been fitted- in fact Gilligan originally planned it as a feature screenplay unrelated to The X-Files. It's one of his earliest XF scripts and it's not a particularly complex piece of writing on the level of characterization, because Gilligan was only beginning to get a feel for the characters- in fact the episode ignores Scully almost entirely to focus on Mulder's feelings about the case. Furthermore, while the episode is overall better than the sequel episode Tooms, the basic plot is almost identical, and that episode had many more great character moments for Mulder and Scully. That one was of course written by James Wong and Glen Morgan (who, like Darin Morgan, are both writing and directing episodes of the revival, and Glen Morgan is co-showrunning it with Carter). Morgan and Wong are much more adept at characterization than even Vince Gilligan. It sounds like you are not very familiar with the show's writing staff and just assume Gilligan to have done all the good ones. He did do many good ones (and some classics) but Gilligan was only the fourth or fifth best writer on this show in terms of crafting character driven masterpieces, despite being the only good writer during the long years after Carter (or Fox?) fired Morgan and Wong.