MaelStorm said:
As Dragonblade mentioned, if monsters don't add 1/2 level to their damage I assume it'd be normal that player's won't add them too. I think it is important for a game system to be balanced that both PCs and monsters of the same level are on par.
Actually, the monsters and PCs may not be necessarily balanced if such a situation was in place.
I'm going to do some math, but I do realise I am making ALOT of assumptions here about how characters level. The main two assumptions are ability scores go up at the same rate as in 3.5 and SWSE and the Fighter does 2d8 damage with a Longsword in the Paragon tier.
An 18th level Fighter who started at 1st level with 16 strength and increased that at every oppurtunity (so their Str is 20) would have a +19 bonus to damage. We'll also that they have a Longsword and deal 2d8 damage with it because they're in the Paragon tier (complete conjecture on my part). That's 2d8 +19 damage with basic attacks, so an average of 28 damage a round. Without this, the Fighter deals 14 (yes, FOURTEEN) damage with his base attacks during the round.
Also, let's assume he also uses Cleave. Cleave deals Str bonus damage (I'll assume, it seem to be that way with the pregen) aswell, so we'll add that to the cases - +19 for the 18th level Fighter with +1/2 level, +5 for the 18th level Fighter without +1/2 level.
The Bodak Reaver (a level 18 Brute) deals an average of 17 damage with its greataxe attack. The Fighter also suffers 5 damage everytime they try to attack the Reaver, so his average damage is 23.
18th level Fighter (with +1/2 level Str modifier and 2d8 Longsword) - 28 damage per round, +19 to an adjacent target with Cleave.
18th level Brute (with + Str modifier, 1d12 Greataxe and Agonising Gaze) - 23 damage per round
18th level Fighter (with +Str and 2d8 Longsword) - 14 damage per round, +5 to an adjacent target with Cleave.
So, despite the fact my math is essentially meaningless speculation at this time

it would appear that the +1/2 level Fighter deals an amount above that of an equal level 18th level monster, while the +straight bonus Fighter sobs as he scrapes away at the Bodak. I'd go with the former as being the actual system.