You're probably familiar with the budget tactical shooter series called Delta Force. Black Hawk Down is the 6th installment of the series and inherits all the good things about the previous titles and executes them pretty well. Unlike the previous titles all your campaign missions take place in one country: Somalia.
BHD has it's own engine and runs at DirectX8, 4:3 aspect ratio resolution. I managed to get it up to 1200p, it refused to go above. All widescreen solutions stretch / cut off the screen. Considering that it's budget titles made in 2003 the visuals are fine. Decent textures, fine poly count and nice drawing distance (like in every other DF title). Framerate is unlimited. Game is compatible with pretty much all Windows versions.
The Mechanics & AI.
You can switch between first and third person. You can lean around the corners, crouch, go prone. Before the mission start you have a loadout screen where you can choose your equipment (depending on the mission sometimes it's limited to 2-3 weapons). You have a map/radar that shows friendlies and items. There's no health regeneration, you can be killed in 1-3 shots. You can't pick up weapons from enemies, but you can use ammo and health boxes that are scattered around the map.
The enemy AI is simple. it gives as soon as a hostile sees you it gives a few seconds to react. If you don't eliminate the hostile during those seconds, then the hostile will start shooting at you. The enemy accuracy has been nerfed, but you have a high chance of getting killed if you simply stand without taking cover.
BHD is the first title to feature a lot of chatter between teammates and music tracks during mission.
There are 16 campaign missions. Your goal is to follow the orders, complete objectives and eliminate hostiles while avoiding any friendly or civilian casualties. You're given waypoints to help you navigate through the maps. Unlike previous titles BHD doesn't have much of long range fights in open areas like fields and mountains. During the campaign you'll be advancing through villages, cities and even bunkers. For each mission you're given a limited amount of saves.
Delta Force series are not for everyone. I'd recommend to actually trying one of the titles to see if a tactical shooter is your thing. It doesn't have fancy visuals or AI, but it's fairly enjoyable.