It was too big, to be honest.
Felt empty and lifeless. The weather effects were nice, but if you have a big open world, and yet have nothing to do otherwise, then what's the point?
Sad, because I really wanted to enjoy it.
As mentioned by others, some people find it fun to zone out while driving around and enjoying the sights. There was a surprising amount of visual variety and it was rewarding to find a notable landmark or capture a scenic view. The racing events were extremely enjoyable for me as well, the controls were perfect and finding shortcuts in the tracks was a lot of fun.