I personally am not a fan. Parkour doesn't feel very smooth and has almost no flow. Also it feels like the maps were made before hand, then they thought of parkour.
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I haven't touched cod since mw2 and wasn't even a big fan of that, but I did love waw and the original modern warfare. Played the beta and honestly it wasn't to bad, it was actually really fun playing cod again. I still most likely won't buy it because I'll have halo, battlefront and TTK to play, and I'll probably end up buying gears.