BF4. You've either heard about it because you're a fan of the BF series, or you heard about it from everyone raging. The game had a very, very bad launch, and to this day, still has quite a few issues. Underneath the problems, BF4 is actually a very fun and rewarding game.
I've played it and own the game. I didn't really like Battlefield 4's online multiplayer especially with the new button layout. I was so comfortable using Battlefield 3's button layout. So when I first played online it was very hard to get used to. Although, I really enjoyed the campaign, it felt like a blockbuster movie. Overall I like it, other than the controls it's a very good game and very enjoyable that's packed with a lot of action.
Haven't played it, but I heard, despite it's terrible launch, that it's a good game. Played BF3 and enjoyed the hell out of that. Although, I wish DICE would work on BFBC3 since BFBC2 was so great. Loved all the characters in the campaign on BFBC.