Seems like the actual game will be pretty fun. Probably the best playing one and most fun to play with a real MGS3 like bent. Though, I don't know the third person shooting felt a bit off. Still, the stealth seemed pretty great and the games movement is very well done. Game also looks great. So as far as a game it should be pretty cool.
Ground Zero's is pretty awful though. The main mission feels shorter then even MGS3's prologue and even less happens in it. Or so it feels. You just go and rescue to people who are pretty close together, you don't even need to stealth around most of the base. Kojima could have easily padded this with little detours that would have taken you around the base and where there to allow you to get access to you're targets. Maybe, have a computer system you need to take out to get to chico. I don't know, something because there's nothing here. Could have easily thrown in one boss battle stopping you from getting to Paz. It's just really lazy. Instead of having a simple firefight at Motherbase to top off the game, it's just a cutscene. This is a really lazily put together thing. So lazy that they couldn't even put in a new trailer of MGS5 or even one of the longer ones. Just a crapily cut together i minute one with scenes we've already seen.
As for the story. Yes it does seem they remote controlled the back up vagina bomb, because you do see a quick glance of a enemy soldier looking out of a passing helio. What happens is that this pretty much sets the base for the coming conflict. Mother Base and pretty much everything you created in PW is gone and this is the opening Salvo in what I assume is Zero's war with the boss. MGS5 is all about us seeing what Snake did that made him evil. Though this is kind of fair story premise, it still dosen't make much sense. If he was so evil and the world hated him so much, how did he make Foxhound in MG1 and 2? Again, this desire to keep adding to a plot that was pretty clear with MGS3 makes no sense to me.
Whatever, I'm sure MGS5 will be a fun play.