There is only two things I hate about Forza, but aside from them, I really like playing the game, just not as much as Gran Turismo, and its really just because of these two reasons
1.its physics, just terrible in my opinion, I can get used to them, but if I don't play the game for more than just a few days, I basically have to learn all over again, its just inconsistent, and annoying, I know FR drivetrains can oversteer easily in real life without TCS, but the problem is, THEY ALL OVERSTEER NO MATTER WHAT even if I have the down force set to max, have racing slicks, low suspension, and a very weak differential, it does not matter, the car will just slide at the slightest bit of acceleration, even the Le Mans cars do it, the AWD's are somewhat the same, but instead of oversteer, they have THE WORST understeer I've ever seen, I practically have to stop just to get close to the braking line, and that's another thing, the brakes in the game just plain S-U-C-K, worse than Gran Turismo's, they just don't work, and ABS makes NOOOOOO difference whatsoever, they'll lock up no matter what, and if they're not locking up, they're not even attempting to stop the car, or they're trying waaaaay too hard, however, when I first heard that they were going to use the same physics in Horizon, I don't know why, but I just thought that it would work best in that game, it feels like it was ment for a free roamer, and not a track racer, and I'm not really sure why......
But the biggest reason that prevents me from completley loving Forza
2.THE FANBASE
Just where do I begin, they are some of the most hard headed, immature, annoying fanboys I've EVER seen, and I've been to Mopar and Subaru car shows, I don't know why, but they just get so offensive if you say ANYTHING that is against their game, they act like Forza is the best game ever conceived by man, and that it deserves every award it can get, they don't care if the car list is (lets admit it) lacking some cars, they don't care if the physics absolutely suck, they will just refuse to admit that their game, like every game ever made, is flawed, so having an intelligent debate with them about their game is just %100 out of the question, I can understand standing by something you like, but when you start to insult people on a personal level because they have a different view on a VIDEO GAME non the less, that goes against your view on it, you have just gone against your own reasoning, because it's unnecessary, and unfortunately most of Forza's fans are like this, and if a community is nothing but a bunch of closed minded clones, than I don't want to be a part of it.
But overall, I'm excited for Horizon, I just hope those two things have improved since I last played FM3 back in 2010, because if so, it will probably be the racing game that I've always wanted to play.