We were here for the auto show - just stayed one night. Contrary to the other recent reviews, our stay was flawless. The hotel is nice, and we were in a very clean suite that was a good value for the money. The staff were all courteous, we got free shuttle rides to the auto show - no problems at all. The only negative of sorts is the continental breakfast - it is free but is exceedingly limited (smallest breakfast selection I think I've ever seen, actually.) Otherwise, great!
One tip - on some sites it's suggested you can park in the Greektown lot for free rather than pay the $20 valet charge here. This may be true on some occasions, but not during special events (eg the auto show), when they charge $20 as well - so you may as well go with the in/out privileges of this hotel.