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.Good hololens gaming will still be stationary and flat. Like a giant smartphone floating in front of you.
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.
AR games tend to suck once the cool factor runs out.