X-Files is one of the most iconic tv series in history but I never got to watch it, does it still hold its quality or turned cheesy by today's standard?
Yes, the quality of it is great. The X-Files was one of the first (maybe the first) TV show that had a movie-like production for each episode. Basically, each episode is like a mini movie in terms of production.
Some special effects show their age, but this is rare. Most times you wouldn't even know that there are special effects on a scene.
If you watch the HD version of the show, there are some scenes that the original film was lost, and then there is a cut to SD. Probably less than 2 minutes worth for the first 9 seasons, but still very noticeable, especially when it comes to SFX.
I purchased the Blu-ray collection of the whole series last June, and added them to Plex. My wife and I have been watching it since, and we just finished the 9th season.
The later seasons (7th, 8th, and 9th) were polarizing, some people hated them, but I liked them as well.
Season 10 and 11, well, they are okay, but feel similar to all the other reboots of movies and TV Shows happening lately.
There are also two movies, the first of which is really good, and should be watched in between the 5th and 6th seasons. The second movie is more of a feature lengthen, monster of the week episode. If you do watch the second movie, watch it between season 9 and 10.
Also, is it one of those shows that have exact repetitive formula for each episode? I hate those.
I know what you mean, and The X-Files isn't like that.
It is not too procedural. A good mix of monster of the week and then the mythology episodes are more serial-like.
I think you mentioned Fringe in another post. Fringe was probably heavily inspired by The X-Files. Some episode and situations are crazy similar between the two shows. I wouldn't call it copying, but more like a homage to The X-Files.
Actually, IIRC The X-Files is playing on a TV in one of the first episodes of the Fringe series.