Otamendi is fantastic on paper because sites like whoscored and squawka don't have reliable stats for being out of position or too slow to catch up to play. I don't think Otamendi's awful but he has to be partnered with a fantastic covering CB or the defence is weakened by him rushing out all the time.There will be posters replying back to you with stats showing how good otamendi is. I've seen with my own eyes that he's not at the standard required. You could say stones is the same, but it's fair to give him a chance, seeing as he's younger and only been here for a year.