The Original MW game is the Best MW game in the COD MW series beating MW2 by the smallest of margins in my view. MW3, as good as it was did lose a few important key elements that its predecessors had hence why many say its the worst game in of the series but it's still a good MW game nonetheless.
Also Infinity Ward (makers of the MW series games) make much better games than Treyarch (Black ops series games). Again that's just my view.
Thanks for making this