Well it is true, that explosion was massive and easily took out the AP and colony complex, the only thing that would perhaps be believable would be the derelict as that was quite a distance but even then the shock wave would have perhaps knocked it back or worse.
The game would be better if it only had the sulaco and derelict being investigated as while aliens over-running the sulaco is odd, it lends proof that the alien queen either laid eggs in the drop ship or a few facehuggers hitched a ride on her back and make smore sense than something that was blown up reappearing with just some slight damage. I consider all games to be non-canon because its EU but i would have perhaps viewed A:CM as canon if it was done properly and as realistic as possible because at the end of the day Aliens is sci/fi which means it needs some scientific plausibility and massive nuclear explosions not only destroys things but irradiates them.
My own personal criticism of the game so far is the design of the aliens and their stance. The alien heads are much better that avp 2010's warriors but they still have dog-alien legs and walk on all fours, i understand the need to crawl when in vents on on walls but as human-spawned aliens they should be bipedal. If one were to view pictures of the original alien warrior and drone from the first film you will see it had humanoid legs, only alien 3 and the other films started using those legs which was justified in alien 3 because it was a dog-alien (runner) but the other films were crap which messed things up.
here is the pics again.
http://t1.gstatic.com/images?q=tbn:ANd9GcQLYEqg0YPgj7pxwXcdeG-y_EgBEpanXbSFseFTQDdiyrUv48pk and
http://t3.gstatic.com/images?q=tbn:ANd9GcRYWlQAWLWUwrtgI3J-sjfz1uvmduPOeaPOvFKM3rEWmFs32-hsVQ and
http://www.toyark.com/news/revoltech-toy-news-14/new-photos-alien-warrior-revoltech-3239/ and
http://www.monstergalaxy.com/lifesize_alien_figure.phpNotice the human-like legs? these are what human-spawned aliens are supposed to look like.
For a game that is "supposedly" trying to be faithful to aliens and the original, they are doing a poor job so far, whether the gameplay and plot are decent remains to be seen but i ain't holding my breath.
Some of you probably know this by now but in multiplayer, aliens will apparently be played in the third person sadly. while i have no problem with third-person views, A:CM is a FPS and so changing gameplay POV could be disorienting for some players. here is the video that mentions it.
http://www.youtube.com/watch?v=VG4opj3dMxc#ws