What would they be and why?
For me it would be Reach and Black ops 2.
Reach was a fun experience and overall I enjoyed the campaign and multiplayer.
Black ops 2. I loved Zombies compared to that pathetic excuse on Advanced Warfare. And the multiplayer wasn't half bad either.
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Mass Effect 2 and 3. Skipping 1 'cos 2 has some good dlc on top of the normal game.