I have played a lot of Crew 1 and it did have good graphics. It got a graphics overhaul in the Wild Run update. It seems there is not much effort gone into making the sequel. All I can see is they have removed the narrative from the game, Whitewash the map (wonder whose bloody idea was that) and add elements like the one there were in ProStreet.
There is no Summit as of yet which was the best part of Crew. No MP still (coming in Dec) though i don't have much hope on it cause Ubi's MP infrastructure is Shite. Crew 2 for me right now is "Wait for a sale" game.
As for FH4, the details that have been released up till now look very promising. I would like to see how deeply seasons mechanics go into the gameplay. Both the games are ridden with MT's so both are culprits in that dept.