But its also somewhat self-mitigating.
Early and mid levels, the +10 damage is a big boost, but the -5 to hit is a pretty big check. Yes, at higher levels, the -5 to hit becomes less of an issue, but when you start talking +3 weapon, girdle of giant str, etc The +10 damage isn't as big of a boost (relatively speaking)
Lvl 16 GWF GWM 25 Str +3 Greatsword Bless (+2) Total to hit of +15 against the AC22 dragon
Ave dmg: 13.25
Ave dmg *with* -5/+10: 13.167
Yes, you do *less* damage using the -5/+10 from GWM
Early and mid levels, the +10 damage is a big boost, but the -5 to hit is a pretty big check. Yes, at higher levels, the -5 to hit becomes less of an issue, but when you start talking +3 weapon, girdle of giant str, etc The +10 damage isn't as big of a boost (relatively speaking)
Lvl 16 GWF GWM 25 Str +3 Greatsword Bless (+2) Total to hit of +15 against the AC22 dragon
Ave dmg: 13.25
Ave dmg *with* -5/+10: 13.167
Yes, you do *less* damage using the -5/+10 from GWM