Some people somewhere may even argue the best game story of all time was Half-Life 2, and they didn't explain anything - hell, the main character doesn't even talk!
Actually Half-Life 2 has horrendous storytelling for a game. I know, because I replayed it recently, just finished Episode One last night.
Half Life 2 has pretty decent gameplay. Cool physics and graphics that still hold up, the shooting feels decent enough (but not the best in the genre), I don't like how linear the levels are (there are never any side-areas to explore, it's just forward forward forward in a straight line) but the gameplay itself is fun enough to carry the game along.
But then come the cutscenes which the game pretends are not cutscenes, but definitely are.
You enter a friendly area and people talk to you. Or more like
at you because Gordon Freeman is a silent protagonist and never responds. That worked in the first game where your interactions with NPCs were limited to the first 10 minutes, in which every scientist responds to you with "Hey Gordon, aren't you late for work? You should have been in the test chamber 30 mins ago, no time for smalltalk!" And whenever you encounter friendlies later on, the interactions are also short and to the point: "Hey Gordon, could you go to the basement and switch on that generator so we can use this train to GTFO of this hellhole?"
They're short interactions where your character not responding makes sense, because realistically all he would respond is "Sure mate." The silent protagonist approach works for Half-Life.
But Half-Life 2? Oh boy.
You regularly get 5+ minute scenes of NPCs talking to you, while you just hop around and toss items through the room while everyone else is having conversations about really important things.
"Oh my God, Gordon, they abducted my father!" Alyx cries, looking at you with sad eyes.
I duckjumped on her head and teabagged her while combing her hair with my crowbar.
"Dr Freeman, I am so honored to meet you! I heard so much about you and admire your academic work!" says Dr Mossman while she rides the elevator with me. I duck down and pummel her cunt with my crowbar. Then I get up and pummel her tits. She keeps fawning over me and tells me how much she respects me as a scientist. I ignore her praises and keep violently sexually assaulting her.
"Hey Gordon, look at this research we've been doing," says Dr Kleiner. I take random items from the shelves in his lab and toss them against his head. He doesn't even react to half his lab equipment being thrown at him.
Yeah, this isn't good storytelling. This is retarded.