Even though Horizon is a very different game compared to Motorsport, GT, DriveClub and PCars I still think I will crown FH4 the best racing game of this gen.
However, people who are mianly into more simulator games won't like it much.
For me WipEout Omega Collection is probably the most fun I've had with racing games this gen. GT Sport currently runner up and Hot Wheels expansion for FH3 not far behind.
I think I've got too much Forza fatigue to pick this up at launch but if the DLC packs are anywhere near as great as Blizzard Mountain & Hot Wheels then I'm definitely in for giving it a shot next year, hopefully at a lower price point.