There is a fluidity to Simmons game that is super enticing, but at this point (IMO) he Draymond without the D or the acceptable outside shot. I wonder if he can be in the middle with Joel spreading the floor on offense - if he can then it is much more interesting - setting picks, rolling, and passing... He isn't a great match around Okafor, there isn't enough space. It is going to be interesting to see him and philly develop.
London - I like your enthusiasm but your posts lean "philly positive" too. While they have done a great job of collecting raw talent. It is largely a group of folks who haven't played much in the NBA, have a history of injuries (hopefully for the league they aren't detrimental to careers), have a couple of folks who struggled to win in the NCAAs, and largely missed on Okafor and possibly Noel. There is an awful lot they need to prove on the court - as there are still a handful of questions.
BTW - I was pro tatum prior to the trade. He just made too much sense for this team. IMO he was always going to be able to score - and that would have been enough IMO. As I see it now, he looks like he may learn how to be acceptable on D eventually.