The new crafted weapons are not nearly as good as most people think...
Lets take a 3x air silver/good khopesh for example. This will likely be the most common devil/pitfiend weapon crafted. It has:
15.525 base damage (5.5 base +6 enhancements * 1.35 crit profile)
3.5 shock
2.2 shocking burst (11 base * 4 crits /20)
2.625 electrifying blast, ssuming no saves (52.5 / 20)
12 lightning strike (600 damage * 2%)
----
35.85 average damage per swing
Now compare that to a cannith crafted hobglob:
18.225 base damage (4.5 base + 9 enhancement * 1.35 crit profile)
7 holy
2.8 holy burst (14 * 4 crits / 20)
10.5 bane damage
-----
38.525 average damage per swing
So even a basic hobglob does more damage then the best alchemical devil beater, and thats assuming no saves from electrifying blast. Now the 6% doublestrike will pull the alchemical 3xair ahead, but since they don't stack it will only be useful as an offhand weapon.
For comparison, even a basic greensteel lightning strike will be a better mainhand weapon then 3x alchemical when you don't need to break DR:
14.175 (5.5base +5 enhancment * 1.35 crit profile)
7 holy
3.5 shock
2.2 shocking burst
2.2 shocking blast
0.7 shocking blast vorpal
12 lightning strike
----
41.775