After the travesty that was unity all eyes are on syndicate. I suggest everyone worried about mistakes being repeated read this!
http://www.eurogamer.net/articles/digitalfoundry-2015-assassins-creed-syndicate-performance-analysis
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Not surprising tbh. I'm pretty sure a site reported that there was a game coming out that felt pretty raw and this seems like it fits the bill. It sounds like they've cleaned up the game quite a bit from Unity but sounds like they are experiencing the same issues but not as frequent this year.