It’s NOT worthwhile without specialization. It has best 1h fatigue to armor damage efficiency when specced, but quite bad when unspecced. Both cases are below 2h weapons fatigue efficiency!
Let’s just compare damage per fatigue point spent (fatigue costs with specialization):
fighting spear, basic attack 37.5 100% armor 8 fat – 4.6875 (there is also +20% hit bonus)
flail. basic attack 40 avg 100% armor 10 fat – 4 (hit bonus vs shields, up to +25)
fighting axe, basic attack 45 avg 130% armor 10 fat – 4.5 / 5.85
warhammer, basic attack 35 avg 225% armor 11 fat – 3.18 / 7.13
warhammer, destroy armor – 8.28 armor (that’s best efficiency for 1h weapon ever)
warhammer, destroy armor unspecced – 4.73 (barely better than spear, while doing only 10 hp damage and risking hit on wrong bodypart that may have less/no armor)
billhook, basic attack 75 150% 12 fat – 6.25 / 9.375
greatsword, overhead strike 117.5 100% 12 fat – 9.79
greatsword, split 97.5 100% 23 fat x2 – 8.47
greatsword, swing 97.5 100% 23 fat x3 – 12.71
mansplitter, split man 157.5 160% 15 fat – 10.5 / 16.8
greataxe, split man 135 150% 12 fat – 11.25 / 16.875
If anything, 1h weapons need to cost less fatigue in general (or 2h more).
