I am a hardcore gamer for over 20 years and I love extreme sports games. I feel that with this one they have nailed most aspects but left aside some very basic mechanics.
The pros are definitely the map, the way the bike and ski feels (which to me seems to be the hardest thing to achieve) but the jetpack feels so clunky and, specially if you're on a race and crash, it's nearly impossible to get back up.
The thing that annoys me the most is the collision mechanics, which you can notice on mass races. If feels like you're inside a pinball machine.
Another ubisoft trademark is how out of touch with reality they are as to what's "cool" and every time they try to portray cool people in any game (far cry, watch dogs, riders republic) it's just a bunch of middle aged hipsters. Who ever shouts "Gnarly Tsunami!" when they see a cool trick or "Alright Dinamite!"? But that's just my view. Enjoyable game to play alone, without a narrator being lame every two seconds.