Battlefield 3 is my most played game of all time with 2,000+ hours (and counting thanks to EA Pass via Game Pass). While BF3 might not be as 'fun' as Bad Company 2 was in terms of multiplayer and single player campaigns, it still provides excellent modern warfare themed stages, vehicles and weapons that combined with a tactful level design make up a great package for competitive online gaming.

As a side note, the single player campaign is fairly terrible for the most part but then again, the meat and potatoes of BF games have been and always be the multiplayer modes (Conquest and Rush specifically).