I think board game like charts would be a little too workaday for a Monster Manual. Better to use expressive language in an RPG product, IMO, and it would not use up too much space. Examples:
"Orcs are vicious fighters and prefer the chaos of close combat. If an orc gets within 30 feet of an opponent, it will close and attack with its melee weapon. Even archers are apt to drop their bows and go for a hand to hand kill. Orc archers are not well regarded in the armies of darkness."
"Goblins are cowardly warriors, avoiding close combat as best they can and using hit and run tactics when they can't. Goblins never get involved in melee if their numbers are not at least 2 to 1 in their favor. 'Live to fight another day' isn't just a saying among their kind -- it's a creed."
"Nothing defines a beholder as well as the word 'arrogant' and that includes during combat. Beholders use their eye stalk powers efficiently and as cruelly as possible. Making a spell caster cower in its anti-magic beam before being devoured brings the beholder great pleasure. Beholders use a special attack against an opponent that will be most injured by that attack and will attack to kill downed opponents if possible."
"Orcs are vicious fighters and prefer the chaos of close combat. If an orc gets within 30 feet of an opponent, it will close and attack with its melee weapon. Even archers are apt to drop their bows and go for a hand to hand kill. Orc archers are not well regarded in the armies of darkness."
"Goblins are cowardly warriors, avoiding close combat as best they can and using hit and run tactics when they can't. Goblins never get involved in melee if their numbers are not at least 2 to 1 in their favor. 'Live to fight another day' isn't just a saying among their kind -- it's a creed."
"Nothing defines a beholder as well as the word 'arrogant' and that includes during combat. Beholders use their eye stalk powers efficiently and as cruelly as possible. Making a spell caster cower in its anti-magic beam before being devoured brings the beholder great pleasure. Beholders use a special attack against an opponent that will be most injured by that attack and will attack to kill downed opponents if possible."