sorry, I can't comment on any hotels but I've always enjoyed the brunch at Shaw's Crab House with locations in the city (21 E Hubbard) & Schaumburg (NW burb of Chicago).
www.shawscrabhouse.com

PS: Shaws is owned by LEYE (lettuce entertain you restaurants www.leye.com), if you sign up for their emails and provide your b-day, you will receive (around the time of your birthday) a 2 for 1 coupon to their Sunday brunch, it is an annual thing for the Mrs & I.