It seems like a fairly cheap move delivering what now comes across as an incomplete experience without purchasing this download content, and seeing as this is being listed with a $4.00/£3.20 buying price, it isn't exactly cheap to experience it. That's not to say the Battle of Forli wasn't an enjoyable and interesting play through, it just wasn't a necessary one.
If Assassin's Creed 2 to you was a satisfying completion, but you can't imagine playing more of it - unless it was in an entirely different setting and offered some new game modes - then the Battle of Forli can be easily skipped.
4/10
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