What ending did you guys get? Are there even different ones? I'm pretty certain there are, since you made some significant choices throughout the course of the game... I got the one where Menendez blows up the drones himself, and then gets captured. I decided not to kill him and he went to prison only to break out again (seriously, how bad is the security of the prisoners in this?). He then went and killed the old dude whose name I can't remember. And then he went and played guitar on a rock concert? What was that all about?
Also, did you duders also have achievement problems? I completed the game on Hardend, but didn't unlock the achievement, and I also didn't get the one for scoring at least 10k in every mission. Annoying.