I got through phases of games, and right now I'm in the one I like to think of everything-modern-is-making-me-angry-so-I'll-turn-back-to-vintage-games - and that's in the form of PCSX2 on my Steam Deck.
Playing the PS2 generation on the Steam Deck is kinda the 'perfect' generation: I can upscale the resolution without a performance hit, I can apply HD texture packs, Retro Achievements and I can drop the TDP to extend the battery life.
Anyway, I never had a PS2 (it was just a touch before my time), so there's so many games I'm yet to discover there. I'd love to hear any suggestions you might have for what I can play on there:
Just a couple notes:
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No GTA games because they're better with the PC versions. While I've bought the games, the account that Rockstar demands people have to play their games makes me angry on principle (a single-player game forcing an online check each week to be able to play it? No thanks), so I've got cracked versions to play.
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No Final Fantasy because I'm not even sure where to start!
So if anyone was around back in the PS2 era, and has some recommendations for games they've loved, I'm all ears. I've been having such a fun time playing these.
Some big thanks to my friends who made and run RetroDECK (my choice for emulating on the Steam Deck), and to the PCSX2 team (who I'm chatting to right now actually, so keep an eye out and in a week or so I'll share that chat with them all about creating and maintaining the PS2 emulator!)
Also, if you do have a Steam Deck, and want to play with the HD texture packs I do, then it's really simple. Just download the pack, and name then according to their game's I.D. code - SLUS-20743 for example, then place it in the texture_packs folder:
From there, go into PCSX2, then right-click the game, select properties, graphics, texture replacement and tick the two boxes I have:
Then you've got the games looking the best they can be!
Here's a link to a stack of pre-done HD textures for a lot of PS2 games, to help you on your way!

I fing love this post. You're making me feel old but I'm glad younger peeps appreciate these games too. Igrew up on the PS2 and you've already got some amazing games there including some I missed and might have to try myself.
Anyway, here's my favourites. You have to try try the Ratchet and Clank games, at least the first one! They're still super unique and iconic today. I feel the most nostalgic about the 1st but the 3rd (going commando) probably has the best gameplay. The second is a longer, harder grind but still great. And the 4th (gladiator) is similar to the 3rd, but less story.
Other than that, Red Dead Revolver, Jak and Daxter, Medal of Honor Rising Sun and Battlefield 2 were all amazing. And Sly 3 if you liked Sly 2.
I have the Jack and Daxter games, and have them not emulated. openGOAL decompiled the games so they run natively on PC - which is the way to play them: https://opengoal.dev/
And I've been enjoying the Quest for Booty Ratchet & Clank game, via RPCS3! I know I didn't start at the first, but I'm having such a fun time with it!