Nothing, as far as I can tell, but political opponents have been running attack ads and blaming him for everything that’s gone wrong in the local (and global, for that matter) economy for the last decade.

I think he did amazingly well in the Trump presidency threading the needle of not giving in to Trump but also not antagonizing him, so Canada had limited personal vendettas and attacks from Trump.

He’s very articulate and careful with his words, and his pauses to think carefully about wording are seen as a lack of confidence. And, granted, it does make him a less inspiring/exciting/dynamic speaker.

Contrast that with Pierre Poilievre, the leader of the Cons, who’s not at all worried about offending minorities and is constantly telling people how Trudeau has ruined everything, is ruining everything, and will ruin everything, for exemple by letting in immigrants, allowing schools to support trans kids (provincially controlled, not in Trudeau’s jurisdiction), and for long medical waiting times (also provincial), etc. Literally everything.