Tried the demo back in the day and didn't like it at all. After finishing JA2 once more I decided to pick up this game anyway as it's now a bargain (7-10€ digital download and boxed as well).
Story and characters are shallow and merc voices and music are mostly annoying. User interface is shitty and doesn't scale well to higher resolutions.
However combatside of things is quite entertaining after you mod the game a bit.
I'd recommend the following:
1. Patch the game to 1.08
2. Install fine tuned mod V 1.7 from Matrix games forum: http://www.matrixgames.com/forums/tm.asp?m=2099797
..among many other things this prevents AI throwing nades a mile away with superhuman strenght and accuracy.
3. Change camera configuration to allow further zoom-out and viewing the map from lower angler, this is important as there is no Line-of-sight indicators in the game
Copied settings from der_baer_fm post in this forum (Thanks!)
edit the system.cfg
r_hcamera_acceleration = "200.0000"
r_hcamera_auto_camera = "1"
r_hcamera_border = "10.0000"
r_hcamera_border_enabled = "1"
r_hcamera_deceleration = "200.000"
r_hcamera_fov = "0.540000"
r_hcamera_inertion = "1"
r_hcamera_max_angle = "2.00000"
r_hcamera_max_height = "50.0000"
r_hcamera_min_angle = "0.010000"
r_hcamera_min_height = "0.50000"
r_hcamera_mouse_invert = "0"
r_hcamera_mouse_speed = "100.000"
r_hcamera_rot_speed = "2.00000"
r_hcamera_speed = "100.000"
r_hcamera_zoom_acceleration = "900.000"
r_hcamera_zoom_deceleration = "900.000"
r_hcamera_zoom_speed = "0.950000"
My boxed game did not have anykind of manual. You can download the manual from steam store page, it contains, among other things keyboard shortcuts. Had to get the manual as it drove me nuts that I couldn't throw grenades 'blindly' if the enemy was not seen. (Hold ctrl to force throwing grenades to desired place).
I've yet to finnish the game, but as 7h30n said I'd recommend the game if you can get it cheaply.