Here is a review of the game based on its classic GOG version and player feedback:
Even decades later, the lighting system is impressive. Staying in the dark is your only lifeline, and the game uses a "Light Meter" to tell you exactly how visible you are.
Splinter Cell is a 4.5/5 for stealth purists but a 3/5 for those used to modern, faster-paced games. If you want to experience the series, the GOG version is the most reliable way to play it today without the headaches of older disc-based copies. Tom Clancy's Splinter Cell® on GOG.com
The official GOG version is highly recommended because it is DRM-free and often includes fixes to run on modern Windows systems. It allows you to download an offline installer that doesn't require any additional launchers.