To explain why exactly Fracture is basically worthless...
The only thing that it could potentially bring to bear is better damage: it is a DoT, which makes it inferior to purely frontloaded damage; it is normal enmity, so it's not useful for tanking; and it is expensive (80 TP compared to the 63.33 that the RoH combo manages). It *is* a *tiny* DPS increase: it's 220 potency in a single GCD and the RoH combo averages 203.33 (150 +200 + 260). Since you can only use it once every 10 GCDs (it breaks combos so you do 3 RoHs and 1 Frac), it amounts to a less than 1% increase in DPS ((220 + 203.33 * 9) / 10 = 205 potency/GCD; 205 / 203.3 = 1.0082) so it's virtually nonexistent. On top of this, because of its cost, the potency-to-TP ratio is way worse (220 / 80 = 2.75 potency per TP; 203.33 / 63.33 = ~3.21), which means that, for any fight where you stand the chance of running out of TP (which is basically defined as "a long fight without regular extended periods where you can't attack"; this is basically Titan HM/Ex and Coil), Fracture actually ends up being a DPS loss.
