Ground zero was the build up to Metal gear solid: the phantom pain. These are your typical stealth games with a little shooting involved if you get caught (think Splinter cell). It's very very cinematic and makes you feel like a real badass and has a lot of history considering the previous MGS games involving solid snake as big boss. And yes, these games have keyboard+mouse support.
I don't have much idea about revengeance other than the fact that it is pure hack and slash with a little bit of stealth thrown in. But again, those are from reviews i had seen the year the game was released.