A Laughable Experience.
The Ohare Hilton makes me HA HA laugh. A Little about my travel patterns, I am Silver Elite with Carlson Hotels also, I am 4 stays away from Hilton HHonors Gold Status.
This Ohare Hilton does a wonderful job of reminding customers how worthless, and pathetic they are. Nickel and diming everywhere No Free Parking, No Free WI-FI, No Free Breakfast. But hey, if you were Gold or Diamond HHonors, Ohare Hilton would treat you different. Lots of Attitude at this hotel. The Attitude seems to be, we are a monopoly at the Ohare airport. We don't have to be nice or try to keep customers happy. Don't like us? Move along, plenty of other customers to keep us busy. Being an onsite airport hotel, Ohare Hilton has no direct competitor.
Checkin is wonderful, welcoming and seemless for HHonors members. I got upto my room and realized I had not inquired about WI-FI. So called House Keeping twice. Phone keeps ringing and ringing. Once answered I was informed by the rude guy, that I was not Gold or Diamond, and for the price(More than $120+) I had paid for the king room there was no free WI-FI. 
No Free WI-FI at a paid hotel in the 21st Century? Not something I expect. All Carlson properties and Most Hilton hotels offer Free WI-FI. Dang, even dumpy Ramada's and Days Inn offer free WI-FI. Most Hilton Properties I have stayed at have a personalized welcome letter, personalized key jacket with Free WI-FI code waiting for me at check-IN: Not the OHare Hilton.
Exploring the hotel property, I decided to stop by the Information desk, and inquire about free WI-FI. Here is the speech I was given: Free WI-FI is only for Diamond members. I asked why it was free at other Hilton Properties, I was told this is a Corporate owned Hilton. Sister properties make their own rules. The guy who argued with me was oozing with Attitude. He was talking over me, not to me. 
Note to Management: Rule 1 for good customer service, teach employees to provide customer service, Not to argue with customers. Especially, frequent travelers.
Not satisfied, I stood back in the checkin line for HHonors. Here is where I was rewarded. Wonderful frontdesk employee who checked me in remembered me by my last name. Gave me the free WI-FI code as a courtesy. Very much appreciated. It would have been very nice not to put me through this hassle.
The room location was wonderful, just as I had requested: Away from the elevators, on a high floor, overlooking the runways. I am an aviation buff. I was in heaven. 
Apparently, this Hilton was built in the 1940's and it shows. Bathrooms although well appointed, are small, almost closet size. And there was a faint smell in the room that reminded me of my grandmas house that I used to visit when I was 5years old: Not an offensive smell, very old and nostalgic. 
Bed is very comfy, and the king room although small is very well designed and has a huge flat screen TV. I took a nap and was wide awake at 1100pm. So I decided to take a walk.
Location, Location, Location, This is where the Ohare Hilton shines. You can walk into Terminal 2 and 3 for people watching, or to grab something to eat. All without stepping outside in the harsh weather. You can walk for hours without getting bored or feeling unsafe. Want to explore Downtown Chicago? Walk to the Chicago Transits BlueLine L train station. Train runs 24 hours. 
Another point for concern, the hotel elevators can be accessed by anyone from the basement(LL) floor. No scanning your key card to get the elevator moving. This means you could potentially find a vagabond walking the hallways on the 9th floor. Oh well.
Will I return? Yes, because I love seeing the runways, and love not renting a car in Chicago. But I would appreciate a customer focused attitude adjustment at Hilton Ohare.