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 had the opposite experience, nearly every game was a blowout, lost several in a row, my elo got as low as 500 something and then Bungie started forcing "wins" on me by putting me in games where my team was about to mercy. High quality PvP experience and Bungie don't belong in the same sentence normally, but this IB was incredibly bad for me.