I been playing it on the ps4. I really enjoy the game, but I do agree the multi-player is lacking. While having more players race at once would help. I noticed just about everyone I race with does there own thing. I ran into times where the game feels empty while I'm driving to the next event.
I got a ps4 at launch, but didn't get to first use it till last Monday. I connected it through wifi and the patch went by fast in about 15 minutes it was up and running. The only problem I ran into was connecting it to Facebook. It froze on that screen for about 45 minutes.