If Hudson's pulse rifle is burst only then consider that the final nail in the coffin to the "it's the most authentic Aliens experience to date" statement, even if it is just an option it wouldn't make any damned sense since the Marines have to manually control their rate of fire if not shooting fully automatic "Remember, short CONTROLLED bursts" (go watch Aliens and anybody with half a brain can figure that out).
I have been concerned about this game for some time now, ever since they started with the whole "this game is canon" BS. However I have been invested in the Aliens Colonial Marines game since 2001 which is when I first read about the concept in a Playstation magazine, hence why I feel like I have to buy this game even if it goes against my better judgement.
I have also refrained myself from posting about my concerns here as I was shot down by the majority of the posters here when it came to my concerns about Prometheus before it came out, which was a movie that turned out worse than even I could imagine.