just to clarify, the superiority of haste boost is not dependant on weapon effects. Here are the numbers with no effects added in:
here are the numbers (in damage/round with 5 main and 5 offhand attacks):
1175.1025...Human Kensai Fighter with haste boost +30%
983.675.......Human Kensai Fighter with damage boost +5
The haste boost is approximately 20% better than damage boost. This is somewhat intuitive considering that the damage modifier for the fighters below is around +50, so the extra +5 is only a difference of 10%. Even an unbuffed fighter with a +30 damage modifier will do much better with haste boost.
If you only had around +12 or so to damage, you would do OK with damage boost (relatvie to haste boost for that build), but I can't imagine that anyone would want to make a fighter with such a poor damage modifier.
Human Kensai Fighter with damage boost +5
main / offhand
5 / 5 .. weapon
8 / 8 .. tharnes
7 / 7 .. inspire courage
1 / 1 .. prayer
5 / 5 .. power attack
2 / 2 .. kensai
5 / 5 damage boost +5
2 / 2 .. fighter enh
4 / 4 .. weapon spec, greater weapon spec
.......... .. 36 unbuffed str (18bse, 5 lvlup, 4 enh, 6 item, 3 tome)
........... .. 8 str (power surge)
........... .. 2 str (rage)
........... .. 2 str (madstone 1)
........... .. 2 str (madstone 2)
16 / 8 .. 50 str (total)
55 / 47 .. total damage modifier
60.5 / 52.5 .. avg regular damage (GS Khopesh)
211.5 / 187.5 .. avg crit damage (+10 dmg to critsw/ kensai+bloodstone)
42.35 / 36.75 .. weighted reg damage (*14/20)
52.875 / 46.875 .. weighted crit damage (*5/20)
95.225 / 83.625 .. Average unhasted damage per swing
95.225 83.625 .. base + weapon effects (0)
5 / 5 .. # of attacks per round
476.125 / 418.125 .. total avg damage per round
894.25 .. total main + off hand
983.675 .. * 1.10 melee alacrity
human Kensai Fighter with haste boost +30%
main / offhand
5 / 5 .. weapon
8 / 8 .. tharnes
7 / 7 .. inspire courage
1 / 1 .. prayer
5 / 5 .. power attack
2 / 2 .. kensai
2 / 2 .. fighter enh
4 / 4 .. weapon spec, greater weapon spec
.......... .. 36 unbuffed str (18bse, 5 lvlup, 4 enh, 6 item, 3 tome)
........... .. 8 str (power surge)
........... .. 2 str (rage)
........... .. 2 str (madstone 1)
........... .. 2 str (madstone 2)
16 / 8 .. 50 str (total)
50 / 42 .. total damage modifier
55.5 / 47.5 .. avg regular damage (GS Khopesh)
196.5 / 172.5 .. avg crit damage (+10 dmg to critsw/ kensai+bloodstone)
38.85 / 33.25 .. weighted reg damage (*14/20)
49.125 / 43.125 .. weighted crit damage (*5/20)
87.975 / 76.375 .. Average unhasted damage per swing
87.975 76.375 .. base + weapon effects (0)
5 / 5 .. # of attacks per round
439.875 / 381.875 .. total avg damage per round
821.75 .. total main + off hand
903.925 .. * 1.10 melee alacrity
1175.1025 *1.30 haste boost