OK, here’s one for the gamesters!
I suppose there are a number of different varieties, but here goes:
Best tactics/strategy game: Close Combat 2. In terms of gameplay and variety, CC3 is better but the historical context doesn’t fit well. CC4 and CC5 are further gameplay improvements, but fighting over the same battlefield many times gets boring.
Best first-player shoot-em-up: Hidden and Dangerous 2. You have a 4 man team. Your own team, which you equip and command yourself. Not a Call of Duty “follow my leader” linear game path. You plan the attack yourself and can switch between viewpoints and issue orders. And you aim through proper iron sights, not a wimpy computer screen crosshair! Best of all, one round often kills you and there is none of this picking up convenient “health” nonsense!