Definitely something to go for if you like shooting. Even for today's standards. Game lacks and character upgrades or development (think Lara Croft) and the pathing and story are quite linear. That being said stories are quite enjoyable and characters are unique and likeable. Game also features a lot of humoristic moments, and writing and conversations in general are very good.
I was also somewhat surprised by the games difficulties so for the one seeking challenge - you will not be disappointed. Another interesting feature is games replayability - increasing difficulty and speed runs will prolong the games lifetime for quite a bit.