Although I have very little prior experience with the Armored Core series (true story: I played one of the demos once), I've reached a time in my life when my need to kill mechs with other mechs must be satiated. Perhaps Armored Core V will be the installment that finally gets me.
Attached is the gamescom trailer for the title, which may be the darkest trailer I have ever seen for a videogame. The sound of global online team battles is appealing enough to cancel out any concerns I have with the video, though. Also, if the mechs seem smaller this time, it's not your imagination.