Digging up an old thread (apologies) but I'm at the Renaissance Schaumberg tonight. It's easily the best Marriott property I've stayed in outside the Downtown Chicago area with one caveat: the Oak Brook Marriott upgraded rooms are also pretty good. This property (Renaissance) is more impressive and may be better for ORD (will update after getting there tomorrow) but Oak brook does have the golf course...
Thank you to everyone for this thread though; I booked this hotel on the recommendations here and they stood up well. Definitely the best for ORD!