Not surprising, to be honest. It is an entirely new direction for GT and as a series that is known for car collecting and a deep single player campaign (it could be argued GT1 is what started the whole genre) I can see how someone would be put off by the online focus of GT Sport.
That being said, I am very happy with the game. The driving is sublime and the content that is here is very high quality. Yes, I want more tracks, I want more cars and I want more offline content, but judging the game as it is, I am happy and I've never had more fun racing online. I hope PD makes a numbered title with all the deep single player content we know and love from GT titles of the past while keeping all the online content from GT Sport, that would be my perfect racing game.
No online only saves though, that was a bad idea, a very bad idea.