Unfortunately Guild Wars 1 is absolutely not a MMO tho. It's a Singleplayer RPG that offers Co-Op Features through social Multiplayer Hubs. And if we would go by this definition Call of Duty WWII would be a MMORPG, too. It was Guild Wars 2 was when the Devs saw the Potential of the Multiplayer Features and created an actual MMORPG.
Guild Wars: Reforged modernizes the 2005 MMO classic with an official Steam launch, Deck Verified status, controller support and multiple QoL upgrades. It bundles all campaigns into a no-sub $20 package, if you like tactical, build-driven instanced play.