I come to this without too much too much expectation because at the end of the day, the protagonist of a whole documentary is a 22 year-old. Even if he's world famous, Shawn's still a pretty unproblematic pop singer so I don't expect too much dramas or surprises to come along. A reviewer said that the drama comes across melodramatic and I agree.
I think the right mindset coming to this documentary is to not to have too much expectation, to know a little bit about Shawn's personality already (sweet, hopeless romantic, drama-free). Only then you can take it for what it is - a glimpse into Shawn Mendes' year of touring, little bit of family and friends, little bit of famous girlfriend, some aesthetic coming-of-age footage and some good jamming sessions.
I do enjoy it though, as much enjoyment as you can have watching a documentary about a modern pop singer with some success.