Just a brief review from Adam Sessler on the DS4. Pretty straight forward, he was pleasantly surprised. Nothing earth shattering. However, it greatly alleviates any worries I had walking it. The DS3 was terrible for shooters.
For a more in-depth (though borderline fanboy) look: I also found this recent vid where the youtuber breaks down all the different aspects. WARNING: The guy is a little excitable.
http://youtu.be/G7tQqEEww6g
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The touch pad looks stupid and won't be useful for much, but it does seem like a fine controller besides that