WOW, what can I say about BMO field and let alone Toronto FC!? Quite possibly the greatest FOOTBALL (yes that is what it's called!) fan base in North America (minus Mexico.. which means just between Canada and US), you will have a GREAT time at the stadium.
The stadium holds about 21,000 people and due to its small size, anywhere you get a seat is most likely a very good seat! You will always be able to watch the game on the pitch without any trouble and they have a great screen for replays! Their fan zone is awesome and is always filled with people and the crowd is ABSOLUTELY nuts which makes it sooooo much more enjoyable (plus their tickets aren't ridiculously expensive like the Leafs, you can get very good seats for $50 depending on the game).
Only downside is their SUPER expensive beer and food but I guess that comes with almost all stadiums. Anyways if you feel like watching some football and want to have some fun, wear some red and get your ass down to BMO field and cheer on the greatest football team in Canada!