Just would like to pop in and say that Half-Life has puzzles and is not a CoD clone. It was a conscious decision to cut out cutscenes in all the Half-Life games for a good reason. And the puzzles and exploration sections break up the game nicely between the heavy action sequences.
Half-Life doesn’t need to “stay relevant”. I hate that term. I don’t give a flying flip about what’s “relevant”. Games today suck. I wouldn’t mind if Valve took the best out of what there is now (not much) and implements it into HL3 or EP3 or whatever they’re going to make, but what I do expect them to do is innovate and adapt with THEIR OWN ideas. That’s what made Half-Life great in the first place. They did something that wasn’t done before. They don’t need to copy from other games. They’re perfectly capable and much more suited to making their own innovations. You do know what the word “innovate” means right? It means breaking new ground. They’re not “innovating” by copying other games to make it “relevant”. When HL2 came out, all the other FPS’s were going with the standard 2-weapon limit (you might say, this was a “relevant innovation” or “adaption”). Meanwhile, HL2 and its episodes continued to offer a full arsenal at the player’s disposal and it did pretty darn well despite this. Imagine that.
Screw relevance.