I agree with @maestro on this one. Locations that are on previous DiRT games should remain on those games. We don't want to play an old game disguised as a new one.
I'm a really huge fan of DiRT Rally because of the realism of the game, and I'm just glad the devs brought some of that to DiRT 4 by adding the 'realistic' and 'gamer' options. So I would give it a 3.5/5 for that.
To be honest I don't know why The Crew got so many bad reviews. I played it and I didn't hate it. I mean there are way worst arcade racer games out here.