Gears certainly brought the genre to the masses but who has perfected the mechanic?
I imagine vanquish is going to get spoke about a lot in this thread and although I think it's a good game I personally think other games have been better. I personally don't enjoy the shooting in vanquish
Vanquish will probably get mentioned plenty, but I don't see much reason for why. If people really looked at all the major components that go into a shooter, much less a cover-based one, maybe don't pick the game whose coolest identifiable mechanic is about getting
out of cover on flat ground. Cover-based shooting by itself is a combo of mechanics, systems, controls, AI, UI...and then the art, sound and level design philosophy that exploit it to maximum utility + variety.
I still stand by Gears being the pinnacle series in this type of shooter. Unlike other games that flirt with cover or make it a main mechanic, Gears is
entirely focused on it to almost every part of its design. Everything you do is built around having a gun, and going into, around, and/or between points of cover. Even the way you traverse is built around cover, both in obvious climb up from cover to more advanced wallbouncing to gain faster speed. You have numerous contextual manuevers built around cover that each entry seems to add more to. Guns like the Dropshot or Torque Bow, and enemies like the Ticker or Kantus all exploit cover and force movement around a cover-filled map. You split up during campaigns to take advantage of different positioning on the play field, that again mixes up how cover is used.
I think Gears 4 is the best in terms of AI, controls, performance and even art design...but
Gears 3 is still the strongest individual game. For two reasons that never get stressed enough in these best of X type of action game discussions:
enemy types and
weapon types. The best shooters that stay timeless tend to have fun things to kill, and fun tools to do the killing with, from Halo to Doom. Gears 3 simply has the most varied pool of weapons and enemies in its series, and the cover-based shooting sub-genre. It's not some AK-47 in Uncharted, some generic soldier in Army of Two, but a clicking Ticker explosion, a slithering Serapede you shoot from tail to head, and you get a Digger, charging Retro Lancer, etc. to deal with it. Also, the sound design in Gears alone is more memorable and identifiable than most
shooters games in general.
I've tried pretty much every cover based shooter out there, and am still waiting for Gears 3 to be topped. Binary Domain the best Japanese attempt, and probably the most satisfying second to second feedback with crumbling robot parts.