Um... easily. I admit I have a bit of shovelware but there are a lot of great games I never got around to purchasing.

I have over 70 on Wii and I rate it as a fantastic system, the best ever? Sure why not

180 ish for PS3. Id say PS3 is my favorite but the PSone and SNES are close behind.

I don't believe it .  What are they?

DS: 110
PS2: 125
Wii: 130
X360:145

My favorite system?? hard to say ...

SNES for the golden RPG era and many good games
N64 for the classics and master pieces like OoT or Mario 64
Gamecube for the notable quality and fucking fun library
Wii: for reunite me with my inner child. less games but pure joy and some classics and hidden gems
X360: for all the greats multis and some , few, exclusives. But not liking the abuse of shooters

I discovered the PS2 many years after its era and I have some game to play but its undeniable it has a massive library!!

Mario Galaxy 

Mario Galaxy 2

Xenoblade Chronicles

The Legend of Zelda: Skyward Sword

Legend of Zelda: Twilight Princess

Metroid Prime 3

Donkey Kong Country Returns

Sin & Punishment: Star Successor

Monster Hunter Tri

Resident Evil 4

Project Zero 2: Wii Edition

Fatal Frame 4

Rayman Origins

Okami

Tatsunoko vs Capcom

Little King's Story

Kirby's Epic Yarn

New Super Mario Bros Wii

Mario Kart Wii

No More Heroes

No More Heroes 2 

Red Steel 2

Silent Hill: Shattered Memories

The Last Story

Pandora's Tower

Goldeneye 007

COD World at War

COD Modern Warfare

COD Modern Warfare 3

Muramasa

Wii Sports Resort

Excite Truck

House of the Dead Overkill

House of the Dead 2 & 3 Return

Resident Evil Darkside Chronicles

Dead Space Extraction

Sonic Colours

Sonic & Sega All Stars Racing

Sky Crawlers

Shaunt White Snowboarding: Road Trip

Zack & Wiki

World of Goo

de Blob

de Blob 2

Disney Epic Mickey

Medal of Honor Heroes 2

Endless Ocean

Endless Ocean 2

Jett Rocket

FAST Racing League

LostWinds

LostWinds: Winter of the Melodias

The PS3 with about 49 - 60 games.

PC by far and yes, it is my favourite system. As for non-PC systems, I'm not sure which Playstation console it is. I think they all have roughly the same amount of games, and I can't really decide which one is my favourite either.

Also..

Sakura Wars

Eledees

Batallion Wars 2

Dawn of Discovery

Boom Blox

Super Smash Bros Brawl

Super Paper Mario

Wii Party

Fragile

Lost in Shadows

Disaster Day of Crisis

Final Fantasy Crystal Chronicles; the Crystal Bearers (yes! as adventure game it's good.Why people say it's a bad RPG when it's not an RPG game?)

Robox

MotoHeroz

World of Goo

Prince of Persia Sands of TIme ( The best version of the game)

Wario Land The Shake Dimension

Rabbids go Home

...

I have about 370 games on steam if it counts but the most games I have on the 360 when it comes to consoles. Now i have already about 35 games on the Xbox One so it's going to get ugly this gen... With so many games preordered till the end of next month I hate being a gamer with a woman and a job. How awful does that sound x.x