I agree. Wasn't it zombies? The first levels set a great feeling and atmosphere, everything was mysterious, and then it felt like they ran out of ideas and were like "hm yeah let's add zombies, because that's not totally something overused". And yes, I don't even remember the later levels and didn't even finish the game.

Not zombies, I remember mutants. Dr Evil[1] created mutants from people, etc, etc

[1] I don't remember the name. It was so long ago that it was when I first got married, the first time!

Dr. Krieger

The demo was the first level in the bay. I think after 100 playthroughs there were like 5 different strategies to clear that level, all equally fun and effective.

And indeed at the end you were just pumping 500 rounds into unstoppable Doom-style monster deep inside some dark hallway.

Agreed. I had amazing fun playing the first bits of Far Cry 1, sneaking through the jungle and playing sniper. It was great. Then I got to the end part, inside dark buildings and suddenly stealth isn't important at all, its more of a twitch shooter full of jump scares and requiring fast reactions over anything. I never finished the game

Those early levels where you fight against humans in a tropical setting were the best part. Every Far Cry game that came after, emulated those first levels, and scrapped not monsters in hallways.