How long is a piece of string?
I enjoyed HL1 incredibly back in the day when it first came out (17 years ago). I thought it's AI scripting, plot, etc. all gave a really cool, immersive experience. Without spoiling it, the endgame levels kinda sucked. How well does it stand the test of time? Dunno, I think it's been given an update (Half Life Source?) so maybe that gave it a bit more life.
I thought HL1, when I played it a few years back, was pretty fun despite it's age. Til I got towards the end game and got lost and kind of forgot about it. Still it was surprisingly enjoyable. To the (later in the thread) talk of it holding up, I thought it holds up pretty well, it isn't like Deus Ex (which I couldn't stomach after a couple hours, can see how it was a good game in it's day, but that day is long past).
HL2 I struggled to really get into though, I can't even pinpoint why I did just didn't click with me at the time. Thought about trying it again at some point but ehh.
To avoid double posting, the Sega sale, so far, seems amazing only because it brought out this gem:
http://store.steampowered.com/app/301120/
EHM is coming back!! WOOOOOO, loved EHM despite being 8 some years old now? It looks like the new EHM is going to be cheaper then the old one was as well so hooray for that too. Especially now that Sega decided the FM series should only see terrible 33% off discounts until the new version is out, because Sega is stupid.
The weird/downside, besides the sale itself:
http://store.steampowered.com/app/357470
You know, as much as I love FM and have thousands of hours into the different versions combined, I've never thought, "wow, I'd love to watch a documentary on how they make the game and why it's popular!" Oh and somehow they thought people would pay $11 to watch this? Really?! Why would someone pay $11 to stream a documentary about Football Manager that is 72 minutes long? O_O