in bfp flying upside down is such an advantage. think about it. i know its not 'realistic' or anything, but if u could fly, y in the hell couldnt u fly upside down? and as in bfp, when ur upside down, its not harder to control or aim, u just do it. ur character is still right side up on ur monitor, the map is just moving. its freedom of movement and would make lots of things better. i know that everyone has meleed someone into the air straight up and u cant really fly up to hit em again cuz ur limited, u hafta rotate around and that gets disorienting. it feels wrong cuz it is. if u could fly, well dammit u would be able to fly upside down. im sure that everyone who thinks it would be harder or whatever r thinking that u would see ur guy upside down, controls would be inverted, or something like that. but thats not the case. i think the only thing disorienting about the game is when u play in the time space chamber room and the entire background is gray, if u dont see the entry way u dont really know where u r.
damn i ramble. anyway, i am one of those who strongly agree with flying upside down.