It's not bad. I am, once again, annoyed that there are 5,000 variations of Skylines and Evolutions and then only a hand full of models from other car brands. I can understand some variations, but they over do it. It may as well be called "Nissan vs. Mitsubishi with some other cars".
Another gripe is the annoying long load times. I miss the simple menus that would load almost instantly. Instead, now I have to watch a GT logo for 5 seconds each time I want to do something different just so it will look pretty or so I can listen to specific music depending on what I am doing.
I have enjoyed the game though. There is a lot to explore and some cool features. Not to mention is if fairly easy to win money with seasonal events. I do miss not having restrictions as to what you can put certain upgrades on. I say, keep the features of GT5 with the simplicity of GT3 and you have a good game.