Have you been reading any of Jeremy Scahill's books?
Awlaki's life was so grey I find it very hard to base an argument off of his assassination. The amount of terrorists he was linked to that actually attacked America was alarmingly high and it was very apparent that he was an enabler by justifying any terrorist attack on American civilians and soldiers. Tactically Awlaki made a very logical target, he could reach islamic citizens in many western countries and indirectly influence their decision to kill citizens. This is why I really don't buy the argument that it was wrong to kill him.
Remember that we are not fighting a nation or even a strictly uniform group but an ideology of extremist islam, we can't finish this war by simply killing terrorists that actually carry out acts of violence, we have to destroy the root of the problem which is the violent ideology imposed by certain people (Awlaki later in life, UBL, KSM, etc).
Now just related to this discussion I would like to point out that America has been very successful so far in limiting Al Qaeda's capabilities to the point of the group struggling to exist. This is highly credited in my opinion to JSOC and the CIA's drone programs. What really worries me is if in ten years the children in the Middle East that were affected by these programs through family deaths will continue the jihad against America. I am not a fan of drone programs for that reason, the collateral damage is far to high.
At the moment the US and her allies have access to very highly trained soldiers who can kill AQ members just as effectively but with lower collateral damage. I would prefer to see Delta, DEVGRU, SAS, JTF2, SASR, GROM etc. carrying out more missions and drone attacks decreasing. The reason I am including foreign tier 1 units is because to phase out drone strikes it will require more special ops than America can handle herself.