My group has played since the starter set came out (July 2014), haven't used feats at all, and are having a blast. The highest level characters are currently 7th level (we use troupe play, so PCs get swapped out a lot), so I'm not sure feats would have made much difference so far. It certainly has cut down on Char Ops somewhat. Of course, it helps that three of my five players aren't all that concerned with maxing their power, so long as each character is effective.
Concerning races, I noticed that most PCs are not human. However, I've seen the same thing in 3E games, as I'm the only one in the group who prefers humans, and since I'm usually the GM...oh well.
Concerning classes, we have a broad mix, with barbarians, fighters, rogues and wizards the most popular. Only a couple clerics, which surprises me, as I think they are one of the more interesting 5E classes. We've had no issues with power balance between the classes - each gets to shine in its own way, and having a good mix is still a good idea, as it has been in every edition of the game.