Summary by @tldr:

It is a quick and easy way to "beef up" any smoothie, and a great alternative to the wild greens that I recommended last time (link provided at the bottom of this post).
The health benefits of Garlic include such capabilities as boosting the immune system and detoxification, almost like a combination of the Honey and Kale already mentioned.
I like to increase my Garlic intake prior to the cold & flu season of winter anyways, so throwing some into a smoothie just makes sense.
Though I wouldn't suggest drinking a Garlic-enhanced fruit smoothie before going to a meeting or job interview, I still think that throwing a raw clove into the mix can be beneficial and worthwhile.