I FOUND THAT IF YOUR GOING TO PLAY AN ONLY DAEMON HUNTER FORCE THEN BIG GUNS WILL BE YOUR FIRST PROBLEM. THEY HAVE DREADS AND LAND RAIDERS BUT NOT MUCH ELSE. I HAVE BOTH IN MINE. TRY TAKING TRANSPORTS, DON'T LET THEM WALK. YOU'LL HAVE PROBLEMS.
One of the great strengths of the DH list is their versatility. They get so many good options, and so much you can do with the list. A DH with a decent sized retinue can do massive damage to the enemy during the course of the game. Heavy firepower is only a small problem, They still have a lot of powerful choices to work with. Grey Knights themselves are great in close combat, and aren't too shabby in shooting (but CC is probably the better option).
Weaknesses? Well, unless you don't want to use Grey Knights, you tend to be outnumbered, but otherwise I'd say a good list can handle anything (especially Chaos!)
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