I think you have to take it within the context of when it came out. CoD4 and Mass Effect came out 9 years later. There wasn’t anything like HL in 98. Enemies that talked to each other and flanked you? Unseen before. Does it stand up to games now? We’ve learned so much since then. But I think you’d be hard pressed to find a modern shooter that didn’t trace its heritage back to HL.
You go first. If you only share a little, everyone else shares a lot. If you share a lot, everyone else only shares a little.