Hijacked is the worst CoD map ever for spawns, I think. I run under the ship in TDM unsure whether I'm flanking the enemy or not. I'm just hoping I come at them from an angle they're not expecting.
I don't play TDM but rushing and flanking makes them spawn everywhere. So if they are in one corner of the map and your team is in roughly the middle and you flank them their team is gonna spawn behind you.