I think the reason many people don't like Brewer, or don't think he should be on Canada, is b/c there is so much hype around him. Management absolutely loves Brewer. They go on and on about him. I guess some people are just unable to see what Gretzky et al. see in him.
Plus, people mistakingly label him as an offensive defenseman. NHLers, management, media, fans, etc. They all talk about his offensive abilities, but he's never been much of an offensive player, save for one season in junior. Perhaps the potential is there, as he's a great skating defensemen who joins the rush and has a hard, accurate shot, but he's never proven that he is. If people stop referring to him as an offensive defenseman and appreciate him for his other abilities, they'll realize he's a good defenseman.
I think he's a pretty solid defender. He's not perfect, and he definitely has things to work on, but he's good. I think management sees that Brewer can be a part of Team Canada for years to come and wanted to expose him to that experience well in advance ... much like Jay Bouwmeester. To me, Brewer quietly does his job. He's not flashy or outlandish. Since he's not flashy, I think he's overlooked by many, b/c he does his job so quietly and doesn't attract attention. He just does his job. I like a guy who can simply get it done!
Sure, he makes mistakes, but even the most seasoned veterans make mistakes. Brodeur let in a weak goal against Slovakia the other night. It happens. McCabe, who many believe should be on the team ahead of Brewer, made a few glaring errors in the playoffs this past year. **** happens. You just hope they learn from their mistakes.
Furthermore, and it was mentioned by someone else, Brewer seems to thrive in international games. He had an awesome World Championships and a great Olympics, at the young age of 22. Management knows this. I honestly think it was more of a dream for him to play for Canada than to play in the NHL. He's a proud dude.
One of the things Brewer does need to work on is playing with more intensity and using his size for more of an advantage, but he has all the intensity in the world during international games. It makes Oilers fans wish he could play like that when he's not wearing the maple leaf. Perhaps Toronto should look into acquiring him.