https://www.gamespot.com/reviews/earthfall-review-an-inferior-invasion/1900-6416947/

It’d be easy to dismiss Earthfall as nothing more than a Left 4 Dead clone, and you wouldn't be wrong to do so. Despite riffing on well-known and beloved source material, Earthfall drags, with unremarkable missions and mediocre gunplay weighing down almost every action-packed setup. Any potential it shows is ultimately undercut by one thing or another, and your enthusiasm suffers along with it.