Room was great, the mall was great, the staff were...

Room was great, the mall was great, the staff were also nice and helpful, but queued for longer than 2 hours waiting to check-in. there were 2 self checking-in machines - one was offline and another could only recognise about half of the travelling documents of the visitors. What a shame to the Sheraton brand for such servicing efficiency as a 5-star hotel.