Half-Life 2, Max Payne 2 and Mass Effect because I‘ve been an impressionable teenager and a nitpicking adult.
I recently played Kotor for the first time since its release and unfortunately, it really felt kinda cheesy and bland. But right before that I played Disco Elysium so that was maybe the wrong order.
'Consumers are not okay with okay': Take-Two boss says BioShock 4 is taking so long because the company's goal is 'to make the best entertainment, not necessarily the most entertainment'
GOG also has more classics and does some work on them (together with the communities) so they run better on modern systems.
That’s also heavily implied during the game.