Re: 7/10 at best.
While it was a tremendously entertaining game, Shadow of Mordor isn't the same thing at all. The sad little story they've attached to it might as well not be there at all. The Arkham games are still the pinnacle of an action/story hybrid. Mordor is pretty much all about the action.
I rather enjoyed the first Witcher, but in the second one I always felt hindered by the interface. Fighting started as ludicrously hard and very quickly moved to ludicrously easy. Repetitive environments, aggravating quests... For all its buggy quirks, I still liked the first one more. I'm definitely going to give 3 a try, at least. Maybe once someone's patched in (probably 3rd party, going by my experience of 2) control remapping properly.