That series premiered when I was 9. I watched it because my older brother was 15 and I wanted to watch whatever he watched. My thoughts are:
1) Not sure it'll hold up against expectations for broader story arcs across seasons like you get in most prestige TV today.
2) There are a lot of episodes of that series that are genuinely gruesome/scary/dark. For example, the Tooms episode from early in the series made a particular impression on me when I was young, but S4E2 is very disturbing at any age. That one is probably the most infamous example.
3) Monster of the week stuff is fun to varying degrees but the overall mythology never amounts to anything. It's all nonsense and Carter never had any plan for where he wanted any of it to go. If that's the stuff that interests you, you will end up baffled and disappointed.