Personally, I find that D&D has dropped the ball on distinguishing creature size.
I'd have loved to see a much larger damage scaling based on size when appropriate to the monster. Beyond simply damage, incorporate being struck by huge creatures with push effects and or prone. Even just giving those reach based creatures greater access to Threatening Reach.
The thing is, I see little reason for such differences to exist in the current state of the game. It isn't a matter of balance, since PC's don't have access to Large/Huge/Gargantuan size.
As an example: Fomorian Butcher (size Huge/Elite Brute) from MM2 does Reach 3: 4d4+14 as a basic attack at level 22. <high critical>
Poisonscale Savage from MM2 (Medium/Brute) deals 2d6+3 on basic attack for a level 2.
The difference in damage is solid based on size alone. However relative to the PC's expected HP from levels 2 to 22...this is a bit of a joke. The PC has no reason to really fear a creature of this size based on stature. They are free to walk in and stand firm against a creature that dwarfs them because mechanically, this creature's size simply means there is more of it to hit and that it could attack you on its turn from a farther distance.
I'd have loved to see a much larger damage scaling based on size when appropriate to the monster. Beyond simply damage, incorporate being struck by huge creatures with push effects and or prone. Even just giving those reach based creatures greater access to Threatening Reach.
The thing is, I see little reason for such differences to exist in the current state of the game. It isn't a matter of balance, since PC's don't have access to Large/Huge/Gargantuan size.
As an example: Fomorian Butcher (size Huge/Elite Brute) from MM2 does Reach 3: 4d4+14 as a basic attack at level 22. <high critical>
Poisonscale Savage from MM2 (Medium/Brute) deals 2d6+3 on basic attack for a level 2.
The difference in damage is solid based on size alone. However relative to the PC's expected HP from levels 2 to 22...this is a bit of a joke. The PC has no reason to really fear a creature of this size based on stature. They are free to walk in and stand firm against a creature that dwarfs them because mechanically, this creature's size simply means there is more of it to hit and that it could attack you on its turn from a farther distance.