This is a joke right? Reviewing an airport? Pearson is a behemoth. You will often find yourself walking long distances between gates or to find something mediocre to eat at Best and you better believe it will cost far more than it's worth. But that's airports so if you expect better you should probably check your standards.
Everything of course is easier if you don't have to be bothered with US Customs. On my most recent trip I did go to the US and Border Patrol detained me for random inspection. It was quick thankfully but also dehumanizing. Is that Pearson's fault? Of course not. But if that happens the rest if Pearson becomes all the more frustrating. It's also loud and if you want to find a nice corner to go and hide from the world and the negative experiences you just lived through, you're gonna be out if luck.