I remember that the initial levels of Far Cry 1 were amazing jungle/beach scenarios that enabled a lot of different strategies for overcoming the smart human enemies. The last levels, however, were all inside claustrophobic buildings with weird monsters running around. If all levels had the feeling of the first ones, it would be my favorite game of all time.
And indeed at the end you were just pumping 500 rounds into unstoppable Doom-style monster deep inside some dark hallway.