I loved Mass Effect 2, but I preferred the first and I don't think the first warrants game of the generation. I massively enjoyed Gears of War and Call of Duty 4: Modern Warfare, but I really don't think popularity means it's the best.
If you want prove then I suggest going to Google. I'd also like to point out a few of my friends actually have FIFA 12 on the Wii and it's pretty fun, the way it works is also quite clever. I enjoyed it, but it's definitely not something I would buy. So, it's not actually as shitty as you think, so yes people will be wanting to buy FIFA 13 considering the previous instalment was pretty okay in my book.
I think with the number of news outlets and sites like Nintendo-Gamer will have a very good idea of what the (lack of) differences are