Okay so to answer your question I just did a search on the ESRB website. I found Brink, although I can't vouch for how good it is, I have never played it. You can also get Battle: Los Angeles. I'm sure there are others as well, but finding a T rated shooter is not an easy task.
Try quantum of solace
if you have xbox live, you can buy the arcade game called battlefield 1943. Almost fully destructible terrain, the ability to drive vehicles such as jeeps, tanks and aeroplanes, and quality graphics,it's one of the best shooters for xbox 360. And its only $15 AUS
no but maybe
no
No, it's good for most but not first person shooters.
no, battlefield heroes pones them all!
yes....all xbox 360 use the same type of hard drive even though some could be 20,60,or 120 gb. To sum it up, xbox 360 hard drives are good with any model of the xbox 360.
quantum of solace?
Not first person shooters also in the USA we have a Teen rating and not a 12+, but a 10+. There are teen rated FPS like Black Ops for Nintendo DS and in the USA it is 13+
if you get this message on your xbox 360 it simply means that the online version of the game (know as xbox live on the xbox 360) is a different rating from the main part of the game. so for example if if the game is rated T and the message comes up the online part of the game is a different rating, if it is rated M and the message comes up it could be any other rating. etc.
yes
Probably