According to my game page, I had 9-11 non-first party games, depending on whether Eternal Darkness and Starfox Adventures count. So I roughly had only 33% 1st party games.

resident evil 0
resident evil 1
resident evil code veronica
resident evil 4
segam mega collection

no 1st party titles ever bought

Resident Evil 4
Sonic Mega Collection
Sonic Gems Collection
Sonic Heroes
Final Fantasy: Crystal Chronicles
Call Of Duty 2: Big Red One
NBA Live 04

Tales of Symphonia
Metal Gear: Twin snakes
......
....
..
.
Thats it....
...
..
.
WHAT MORE DO YOU WANT FROM ME?!

Baten Kaitos
Tales of Symphonia
Ikaruga
Timesplitters 2
Mega Man Anniversary collection
Mega Man X Collection
Alien Hominid
Viewtiful Joe
Harvest Moon another wonderful life.
Sonic Mega collection

Also got Harvest Moon magical melody and Viewtiful Joe 2 in the post but they have been there for a while so im thinking they got lost on the way too me.

Out of the games on the list the only ones i hate are Sonic Mega collection and Baten Kaitos everything else is just awsome.

From a quick scan and count of my profile's game collection...

54 third party games.
25 first party games.

Some games, like F-Zero, Star Fox Assault, and Donkey Konga were made by third parties. Some games are by former second party devs like MGS: TS, Eternal Darkness, and Cubivore. So if those count as third party games, the list would be closer to 60 third party games and under 20 first party.

Resident Evil 0
Resident Evil Remake
Resident Evil 2
Resident Evil 3 Nemesis
Resident Evil 4
Viewtiful Joe
Viewtiful Joe 2
Killer7
Batman Begins
Star Wars Rogue Leader
Star Wars Rebel Strike Preview Disk
Star Wars Rebel Strike
Burnout 2
Godzilla: DAMM
Gun
Ikaruga
Super Monkey Ball 2
Lego Star Wars
Mortal Kombat Deadly Alliance
Soul Calibur II
Simpsons Hit & Run
True Crime: Streets of LA

Planning on getting Resident Evil Code Veronica X soon to round out the collection.

Tony Hawk's Pro Skater 4
Tony Hawk's Underground
NHL Hitz 20-02
Soul Calibur II
F1 2002