Around 30 or so I think, but a lot of platformers and action adventure though. I still have a mountain of RPGs which I need to finish.

Deus Ex Human Revolution Director's Cut
Need For Speed Rivals
Battlefield 4
Battlefield Hardline
Wolfenstein The New Order
Dragon Age Inquisition
Dragon Age Origins
Assassin's Creed Rogue
GTA V
Saints Row Gat out of Hell
Sniper Ghost Warrior
Sniper Ghost Warrior 2
Star Wars The Force Unleashed II
Tomb Raider Definitive Edition

and about 20-30 non-retail games

Mine would have been on the 30s if i didn't start a game and then stop midway and move to another game. Lol

Good question! Let me think:

Bloodborne
The Order 1886
Tearaway Unfolded
Until Dawn
Dragon Age: Inquisition
Batman: Arkham Knight
The Witcher III
Metal Gear Solid V: The Phantom Pain
Star Wars Battlefront (I guess?)
Resident Evil: Revelations 2
Never Alone
Racing the Sun
Entwined
Guacamelee Super Turbo Championship Edition
Final Fantasy Type-0 HD
Splatoon
New Super Luigi U
Yoshi's Woolly World

So... about 18 games. Not that great.

Tagging

Mario Kart 8 (Wii U) 9.2/10 

1/12/15-1/12/15 (1 day) 

The Wonderful 101 (Wii U) 8.0/10 

1/12/15-1/16/15 (5 days)

*Saints Row: Gat Out of Hell (Xbox One) 9.2/10

1/22/15-1/30/15 (9 days)

*Saints Row IV: Re-Elected (Xbox One) 9.6/10

1/30/15-2/14/15 (16 days) 

*Sleeping Dogs: Definitive Edition (Xbox One) 9.3/10

2/26/15-3/13/15 (16 days)

*Ori and the Blind Forest (Xbox One) 9.5/10

3/14/15-3/17/15 (4 days)

Final Fantasy X HD Remaster (PS3) 8.4/10

5/15/15-5/25/15 (11 days) 

Final Fantasy X-2 HD Remaster (PS3) 8.5/10

5/30/15-6/6/15 (8 days) 

*Tales of Xillia 2 (PS3) 9.4/10

6/8/15-6/28/15 (21 days)

Ratchet & Clank: Into the Nexus (PS3) 7.8/10

6/30/15-6/30/15 (1 day)

*Persona 3 FES (PS2) 9.2/10

7/1/15-7/16/15 (16 days)

*Super Mario Galaxy 2 (Wii) 9.8/10

7/20/15-7/26/15 (7 days)

*Forza Horizon (Xbox 360) 9.0/10

8/6/15-8/11/15 (6 days)

(13 Games)

Wolfenstein: The New Order
Middle-Earth: Shadow of Mordor
Resident Evil HD REmake
The Order: 1886 (ugh)
Resident Evil: Revelations 2
Bloodborne
Batman: Arkham Knight
The Evil Within
Until Dawn
Metal Gear Solid V: The Phantom Pain

Wish I would have finished The Witcher III: Wild Hunt and Fallout 4.

Zelda: Windwaker HD
Zelda: Skyward Sword
The Witcher 3
Splatoon
The Last of Us Remastered
Call of Duty Ghost
Mass Effect 3
Mario Kart 8
Watchdogs
The Order 1886

The Order (plat)
Bloodborne (plat)
Witcher 3 (and dlc)
Destiny Taken King (all major content)
Fallout 4 (will go back to plat)
Dragon Age Inquisition
Sunset Overdrive
Little Big Planet 3

I play games longer than I used to. Completionist habits picking up lol. I am still working on games I got in early dec.  Also note these are games COMPLETED as the title states.  This does not include partial runs nor my online games.  Just finished Until Dawn and Dragon Quest Heros. Next I will finish RotTR and Halo 5. Started them but didn't finish them. Then after that it will be Tales of Zesteria and MGSV. That all pertains to 2016 though. =P

All games were played and beaten via actual carts/disc. No emulation

Ecco the Dolphin
Ecco the Dolphin Tide of Time
Streets of Rage 1
Streets of Rage 2
Michael Jacksons Moonwalker
Sonic 1,2 and 3
Sonic and Knuckles
Contra Hard Corps
Toejam & Earl
Vectorman 1
Vectorman 2
Castle of Illiusion
Decap Attack
Altered Beast
Mortal Kombat 1,2,3
NBA Jam
NBA Jam TE
Street Fighter 2 TE
Aladdin
DKC 1
SMW
SMB 1
SMB 3
Sly Cooper 1,2,3
Sly Cooper Thieves in Time
THPS2
Ico
GTA3
GTA5
LBP3
MGS GS
Contrast
Outlast
Dust
Infamous Second Son
Infamous First Light
Knack
Rayman Legends
Splatoon
Yoshi's Wooly World
Super Mario Land 1
Halo 1,2,3

I'm sure there's more but I can't remember them off the top of my head.