Yeah you've got to watch out for those dicks. There's plenty of trolls that intentionally do that sort of thing. The good part is that they've implemented a system where you can revive any dead characters you want. I've had two invade me at once whilst fighting a really tough enemy and they both spawned
right behind me and I had quite a lot of souls on me at the time too; I don't think that should really be allowed, since how the heck do I have any chance of winning that? It should be one invasion max on your first playthrough, I think, up it on subsequent playthroughs. It's weird since From have changed it to being that you can only be invaded when you are Hollow whereas before you were only invaded when you were back to Human form.
But yes, fighting certain bosses in co-op is so much fun. There's also Player vs Player [where it's not really an invasion but a mode where people just duel] where some members are really quite polite and bow/let you heal up first before you fight, it's just a risk if you bow first because sometimes they're obviously not fighting it out fairly and will sneak a backstab in there before you're ready.
On another note, I finished Ground Zeroes story in one sitting (1hr 40). Can't say that I didn't really enjoy it though. The gameplay seems to bring back a lot of elements from MGS2 and MGS3 (crawling, slitting throats, interrogations, CQC throws, holding up enemies yields weapons, magazines can be thrown, first person shooting mode and first person mode when crawling in narrow spaces are all back. So is "!") Codec is now real time and mapped to L2 rather than Select [although there is tapes that you can listen to which is another version of Codec there's loads of those]. And my fears of it being if you're caught it being easy was put to rest; Big Boss goes down really quickly [short health bar], enemies alert each other as soon as you are caught even if they don't radio one another and the prisoners you have to rescue die in
one hit which results in mission failure. And that's
Normal mode. The tagging of enemies with your binoculars becomes very important since enemies can see you a fair distance away and there's no radar or camouflage now. I really liked the music since it had that dark moody electronic sound that the earlier Metal Gear games had. I must say the game does look stunning and found it really absorbing to play.
On the story side of things, it seems really interesting. Skull Face is an interesting villain, very messed guy
Overall, pleasantly surprised by it and really excited for MGS5 now. My fears are almost put to rest now. I just really liked that it felt more like classic Metal Gear than it did Peace Walker or MGS4.