There are level 20 and 35 versions as well. But, if the item level is considerably lower than your current weapon it won’t perform as well. The trick is to see if you’re getting more flat fire damage than your current weapon; check the % physical converted to fire on the affix and multiply by the physical damage on the weapon. If you haven’t upgraded from Massacre, the basic level 35 version of the warmaul should triple (double-ish. Brainfart) the amount of fire damage from your weapon at 13-35 ish at 15% conversion.
If you get bored of spamming Fire Strike, Shieldbreaker can also be fun as a kiting cooldown rotation caster. You might also look at Build Compendium X for inspiration now that it’s up.