Who wouldn't? They were one of the best 60's bands. One of the bands which invented styles and sounds that are used today. You should feel stupid that you didn't know who they were and how to spell knew, not new.
Who doesn't know who The Who are. Isn't that like asking who are The Rolling Stones?
I haven't seen the half time show yet though I've heard they were a bit disapointing. They are my favourite band and I would really hope there are few people who haven't heard of them.
When the halftime show started it was all a bit of a dissapointment. The Who, which quite possibly could be the greatest band of all time struggled through there most popular songs. Roger Daltrey, there singer, clearly was way past his prime.