Hmm Just returned the game to my friend.
Overall the game is really promising

the only part that I don't like is the aiming cause I'm too use to COD... I change the setting to Alternate --> Same button as COD
but when you hit L1 for aim you don't have to hold it, it will stay in aim mode... and when you want to release the aim you have to release the L1 button again. 
Think it will take me some time to get use to it.
Graphic wise is really awesome but too bad the effect that they have in the environment is not real enough. E.g. when you shot your RPG on the ground you don't see any hole there it remains as it is. The AI wise is quite ok not that dumb

but your own comrade sometimes is kinda annoying you might hit them a few time when you first start the game.

Just hit that guy when he is talking using melee and he will shut up
Can't wait to join you guys later in online mode later hope that this game can really superceed COD4 interms of online game play later

Just put the aim hold option to 'On' for that if you're used to holding down the L1 while aiming.