Reality of PC games...?

As a former shooting enthusiast I find 'Far Cry' very realistic and also appreciate the lack of repeatedly reused maps resulting in maze like symmetry. 'Max Payne' was sort of OK. Games like 'Halo' are not realistic and are not meant to be and also reuse maps frequently. Also many later games are like American films, with over the top special effects which are too unrealistic. The original 'Unreal' was quite good, but the later ones get faster and less convincing. I have not played that many, so can anyone more knowledgible recommend any older games for me to enjoy please?