I know it's not to everyone's taste but I thought it was quite good. Almost every match was close, with only one blowout, matches were made pretty fast and I personally like the Fortress mode. And the new SMG is really good.
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I think some people hate everything new in the game. It's kind of a funny mode with the team-firing shoot-off aspect. I felt like I played a lot, but didn't get rewards since I lost +80% of my matches. But that's pretty typical of all IB's? It also seems like there was a shortage of "worse IB ever" posts, which surprised me. Or maybe I didn't notice because I was at the beach. Cheers