Towards the end of S2, I'm definitely getting tired of monster of the week stuff. Fuck ass-pulled mystery stuff (the zoo episode had some good details, but damn are those aliens making dumb mistakes), and fuck serial killers. The main good thing about most such episodes is Mulder & Scully, and many of them don't even have much of it, and what's there somehow doesn't seem to have much emotional content. I actually wonder if late S2 was the low point of the actors' infamously bad relationship.
A new thing that I found to like is, what seems to me, a surprisingly sober look at mainstream and fringe American culture. Our heroes really get around and talk to people of all walks of life. Mystery must be one of the formats most in need of realistic people in order to make the extraordinary stuff believable. I think the series creators understood that and delivered.