Started Homefront The Revolution a few days ago.
The game is quite alright. Can't really understand the sub 50 Metascore. I guess they patched quite a bit. It's a little buggy but not a big deal. Graphics are pretty good thanks to CryEngine. Especially the faces of some of the main characters look amazing. Gameplay-wise there isn't even that much shooting. It's a lot stealthier than I thought. Though the shooting itself really isn't all that great (at least with the shitty weapons at the beginning of the game).
The game isn't really open world, kinda comparable to Witcher 3 I guess, but obviously much smaller. The game world is pretty good and you certainly get that revolution feeling.
At this point I would give it between 6.5 and 7.5.
So if you find it for 10€ like me, you can safely pick it up.