I enjoyed the game, the wide selection of weapons, the great scenery and fire... The flamethrower is still my favourite weapon in the game. I liked some of the unique elements of the game, like how if you get really wounded you have to do first aid to heal. No ducking behind crates and hoping for the best. It's kinda funny what injuries you get sometimes... (How'd that pole get in my chest?)
Overall, I enjoyed it but it sometimes felt like a chore.
The only thing that really frustrated me was the ending.
"Hey Look! It's the Jackal! Hey... where did my gun go? Why can't I shoot? WTF?"
*sigh* I'd go into far more agonizing detail, but I like to let other people be the spoilers.