The guy will be at 250K from SODAD as per the arrival. What else are you expecting? If you want something other than your dictated spacing and speeds as per the arrivals you probably better ask for it. The flow arrangements into Dubai are certainly lacking but expecting the ACC to give you anything other than what you ask for is a bit rich.
Not what I am saying at all.
My point is that just about any modern aircraft (don't get me started on a330s or a380s) will take quite a few miles to reduce from 300kts+ to 250. Giving them 250 5 miles before sodad doesn't cut it - they'll cross sodad at 290 or so, often way too high, with the prededing in the sequence 6 miles or so ahead and much slower.
The Star says 250kts AT sodad - NOT reduce to on crossing.