It will be great for a lot of things. Gaming really isn't one of them. AR is too limited in the experiences it can give you. The technology is definitely something I see becoming huge for home repair and improvement, construction work, education, etc.gaming to a certain extent. i view halolens as a replacement to smartphones. it will play games just not the "full" "AAA" games but cute time wasters while on your commute or in a waiting room.
but it will be amazing to have google maps on that kind of device. or bring up reviews to a cafe your looking at. or taking a call hands free. or other smartphone esque stuff.