There is not much to specify for the question, its really simple: Which title is the first game you have purchased on Steam? Was it a good decision? How much did you pay? When was it and what device? You don’t have to answer all questions, this is just a fun discussion to have.
You can check your history: https://store.steampowered.com/account/history/ Edit: Some in the comments pointed out that the purchase history doesn’t go back all to the beginnings of Steam. So if you purchased something earlier, it won’t be listed on your account.
(I reply with my game too.)
Half-Life 2. steam was mandatory to play it and the shitstorm around it was something else. But I learned quickly, that youbcpuld just switch languages to not only download the original version but also the uncut one. Loved steam ever since.
I remember that whole kerfuffle. It spawned the first meme gif I can recall seeing. Warning, moderately NSFW:
spoiler
Wow, that unlocked a few memories.
Man, so many had one of the Half-Life games as their first game on Steam. How everyone hated Steam in the beginning, and now, most seem to love it. In fact in Gaming, Steam is one of our saviors it seems.