Resident Evil (1-3 obligatory, 4 - mix of old and new, 5/6 - for co-op)
Dead Rising 2 - nicely done sandboxy game, althought the time limit can be rage inducing. That's ok, use trainer
Dead Island - it could be a good series, but even in co-op it suffers of bland quests, and the level-scaled zombies killed replayability for me
The Walking Dead - interactive movie with adventure elements, fake C&C, but for one walkthrough it's good
They Hunger - one of the most memorable, and best mods for original Half Life.
Evil Dead : Regeneration - as a ED trilogy lover I really liked it. The first one - Hail to the King had horrible respawning zombies mechanics. The second one was console only. Regeneration has got classic weaponry from the series, and some new things. Little, but nicely done puzzles, fighting mechanics are solid, and it has Ted Raimi as a voice actor for little annoying sidekick Sam