I was thinking of also buying a 7200 rpm HDD rather than the normal 5400 rpm but i had doubts that it might affect the performance of my PS3 and overheat it..is this true?
I don't think it's worth it, it will not overheat but it might sound more. And the performance gain isn't so big…slightly faster install times and load times (from hdd).
Yes they counted the Saturday and Sundays stats since the patch went live as “last week”. So next monday should be the next time it resets and you're able to get the trophies.
Online is great in my opinion, the more you play the better it gets as you get used to the controls and learn the maps. Also you unlock new classes and abilities which enhance the gameplay.
To be visible on EA's leaderboards you have to register with them and be online while you play. Me personally I didn't register with them so I'm not showing up there although I have the platinum and some good times.
