[sdiy] Today's Pet Peeve: PCBs

[MTG]

So my pet peeve is different. While soldering up some prototype boards 
received from DirtyPCBs (Wherelabs) I found one copy of board A that had 
two feedthroughs shorted and one copy of board B that had traces with 
gaps in them (missing copper).  Same thing happened before on boards 
from OshPark. I wish I'd noticed before I soldered the parts on!  I 
guess I need to super inspect each board. The gaps aren't really that 
hard to see, but the feedthroughs I needed to buzz out to find. 
Fortunately that one was fixable. The missing copper one is quite a few 
traces and not sure it's worth the time to rework it.

So, any sage advice? Is PCB testing worth it? Or is the cost of a couple 
of bad boards less painful.