watching this video http://d3db.com/media/video/11 ( demon hunter gameplay)
something strange happens.
Apparently, we can control the remote to throw grenades. but a major problem seen in this video, was the distance to throw grenades when I saw that, he can not control it right.
If you look right, he tries to hit the grenade at a certain point, but he misses several times.
He has a certain difficulty of hitting targets middle-distance and long distance.
especially when the target is near you.

I think it's fine. It's fun and you can pull off some pretty fun trick-moves. Not super practical all the time but I think it will definitely have its strategy. Plus, you can throw a rune on it and change the behavior if you're having trouble gauging the throw distance.