Well, I'm a grad and I was an ambassador during my time there, so let's see if I can be of any help.
eunjukim
1. Can someone tell me about the student culture at Rotman?
I found it to be very inclusive, and there is a very strong camaraderie that builds as first year progresses, since you're all in this journey together. I say "journey" to sugarcoat it, but it's a crazy first year, and everyone suffers through the tough times together so we all understand each other in ways that non-MBAs do not. Don't be surprised if in your two years of your MBA, your best friends are your MBA family.
There will be cliques, of course, although I've found this more to be an effect of career choice rather than nationality or any other factor. Those who are pursuing consulting/strategy stick together (we do have to practice case interviews with each other after all, and spend a ton of time doing so), and those who pursue finance stick together. It's just because of interests, taking the same classes, practising interviews... all that time together, naturally you form groups. I see those marketing kids stick together too. Still, we're all friends, and I knew most of my entire year of 336 students.
eunjukim
2. Does it make a huge difference being at the #1 school Rotman vs. Ivey, McGill, Schulich when it comes to getting opportunities with employers as well as salaries?
No, it does not really make a huge difference on which school you go to if you reach your goal in the end. Rotman and Ivey are the Top 2 consulting schools, so those were the only ones that made my list of criteria, and Ivey lost out because it was a one-year program. That was my choice. But you didn't say you want to focus in consulting, so... although you have to consider other things. What's the breakdown of those placements? How many of those students got into marketing? What kind of marketing company? What position? Is it the Nike, the Coca Cola or the small no-name mom and pop stores?
Don't look at averages, look at the breakdown of what you're aiming for and filter those out. In one year you could have 30 grads go into finance and make $150K a year, and another 30 grads go into something else making $50K a year, and that's still a $100K average. All I know is Rotman has grads in Nike, in Coca Cola...
Also think about the opportunity to network. Ivey is a great school so companies will make the trip. McGill is in Montreal, so your career placements will be in Quebec, a francophone community. Schulich... well, if you can hold a fork, you can go to York. Kidding aside though, within the local Toronto applicants, York doesn't have that great of a reputation. I don't know if they've fixed their admissions process; they used do admit students without a formal interview, so you'd have classmates that's never been interviewed and can't actually speak English, and that kills teamwork, among other things. Schulich is also far from downtown Toronto, while Rotman is smack in the middle of it. Many times I've had contacts at these consulting firms I was networking with suddenly have a meeting cancelled and can meet in 15-20 minutes. From Rotman, I can make that meeting. Anywhere else, I'd miss that opportunity.
eunjukim
3. If there is any current student / grad here: Anyone studied or placed in business analytics / marketing ? I would love to hear more about the opportunities in that field
Unfortunately I didn't go to analytics (though I had a taste of it since you need to be strong in it to go into consulting) or marketing, so I can't help you with this one.
And yes, Toronto is an expensive city, but everyone makes it work. In my personal opinion, it's with every penny you spend. And don't get too hung up on the placement statistics, there are many inaccuracies there since filling that questionnaire isn't a requirement at the end of the MBA or six months out. Entrepreneurs, for example, are probably considered unemployed. It's better if you can get a better picture of what's happening in marketing at the schools you mentioned, who is going where, who is placing at a higher rate with the top companies, whose marketing students are getting better salaries... don't look at the overall, since you're only focused in marketing.
Good luck!