It's hard if you just rush about normal FPS-like. This game has a sort of 'stealthy' requirement about it. However, it is not over-stealthy.
The stealth element does work though - I've sat in a bush before whilst enemies on patrol walk towards me and then I've blasted them at close range with a shot gun.
Invest in a silenced pistol early on.
Don't take on loads of additional missions at one time - ie a source might offer you 3 missions - don't agree all 3 there and then. The reason for this is some missions time-out - there is nothing in the manual regarding this, but sometimes if you take too long to claim a reward then you end up failing getting the reward. Also, with some missions something can go wrong meaning you need to load a saved game.
Use multiple save games and save often.
Watch how much you carry - try to keep your load to 50KG max - any more and your character tires quicker.
The stealth element does work though - I've sat in a bush before whilst enemies on patrol walk towards me and then I've blasted them at close range with a shot gun.
Invest in a silenced pistol early on.
Don't take on loads of additional missions at one time - ie a source might offer you 3 missions - don't agree all 3 there and then. The reason for this is some missions time-out - there is nothing in the manual regarding this, but sometimes if you take too long to claim a reward then you end up failing getting the reward. Also, with some missions something can go wrong meaning you need to load a saved game.
Use multiple save games and save often.
Watch how much you carry - try to keep your load to 50KG max - any more and your character tires quicker.