Is Canada better today then when he started as PM? I struggle to agree that it is. Housing is as bad as it has ever been and the immigration decisions seem to have been so careless that even people that would agree with immigration as a general principal are horrified by it by and large. The Canadian dollar has collapsed VS the USD. I guess it always ends bad if you stick around long enough.
There are many indigenous communities that now have water that are better off than before he was PM.
Speaking for myself I think things in 2019 were better than 2015. The pandemic and things after the pandemic (hi inflation and spiking interest rates) have not been quite so fun but these are global issues and people around the world have had a similar experience. Arguably there is more Trudeau could have done but some things are beyond his reach (eg. Bank of Canada sets interest rates).
If you're a person without an established home you own you probably feel things are disastrously worse than 2015 when you presumed that surely eventually you'd own one. If you already own a home you probably care quite a bit less.
Housing was deeply dysfunctionally broken in the major cities well before Trudeau became PM in 2015 and the lazy status quo approach of his government ensured that the contagion of housing shortage would spread Canada wide. It's mostly Provincial and Municipal governments that are at fault but plenty of fault for the feds too. Despite the fact that Fed housing policy right now is better than it's ever been the damage has been done.