You have to consider the people that will be in the waiting room. Do you really want to buy nice furniture and such when people will be bleeding and puking on it? You need something that will clean up easily, thus the pastic or vinyl chairs and tile floors. You can't have real flowers due to patients with allergies. As for the TV, what do you expect them to show? You aren't going to please everybody no matter what you have on TV. And if you go in the middle of the night, there isn't much worth watching on TV anyway.
A greeter? What would they say? Greeter: "Hi! How are you today?" Me: "Not good...I'm at the damn hospital".
As for magazines, maybe they don't have better ones because people would keep stealing them. No one is going to steal the Journal of the American Medical Association.
Maybe you should bring a book or a laptop the next time you go to the hospital to keep yourself entertained.