How is he not. Polling shows the Liberals over 40%.
I'm not a fan of Trudeau and I think there are many people who supported him who have been somewhat disappointed. I disagree that he's out of his league. Maybe I just had low expectations but I think he has performed okay. Although many of his policy decisions - which don't seem unpopular - I disagree with.
I think his cabinet is one of the reasons he's done well. I think he has many competent people there. Wilson-Raybould, Freeland and Philpott have all been strong, especially considering their lack of experience in politics. McKenna has also been a competent minister. Carr is considered to be doing very well as is Goodale.
Morneau has been a real disappointment as has Chaggar, and Monsef. LeBlanc was awful as House Leader. Nobody else stands out as glaringly bad.
Harper's cabinet definitely wasn't very strong. Although that's partly due to his leadership style, those who stayed did as he wanted.