Yep, that's pretty easy to camp that position until your shuttle returns with more aleph. Antagonist are forced to run on your bullets, and even if it will be Lucus with his shield - anyway he don't have a chance even in 1v2 melee, and if there is more of players still alive?
Same problematic area is when they waiting for the elevator - you can spawn on several points, yeah, but all of them are on the opposite side of the elevator, and players will either shoot you with turrets, or just unload all weapons as soon as you jump out of cover because your position is obvious, there is no way to flank them undetected.
On the second map, second boss area is not so bad as previous one, but it's huge open ground, and you must be really lucky to reach someone in close range (if you not playing sniper character) before being detected. At least boss there sometimes takes real attention from the players, but still it's hard to fight on such an open ground, where you have little chances of approaching undetected.
Rest of the areas seems better, because they have spawn points both behind and ahead raiders, and sometimes even above. That works good because they can't just lock on your position with whole team, they don't know for sure from where you will attack.