SSX used this multiplayer 'ghosting' model last-gen, and it actually worked pretty well but, as always, a few people complained that you couldn't really bump or hit other players while racing down the mountain like in past versions of the game.
Now in Driveclub... it is a car racing game, and actually an arcade-ish type of game, so I believe avoiding other cars is a very natural part of what racing it is all about, even though some people online can be really a-holes (like pretty much in every online game)
... IMO some of you guys just need to chill-out.. it's just a game... some of you come here venting about EXTREME frustration, anger, RAGE, etc... come on guys, take it easy, there are bigger problems to direct your anger at, and I mean this in the most kind-spirited way.
What? Was the whole chill out thing directed at me? I'm just making suggestions to maybe help better the game...
Also SSX should have no ghosting, aren't the tracks in that game pretty open?