Diablo 1 gets lots of atmosphere because you roam these halls alone. Ever noticed the anxious breath sound in the cave levels?
Very true. The atmosphere is something Diablo 1 did very well. Mercenaries could impact on this. Having someone around you is comforting and can brighten a dark atmosphere. But then again, Diablo 1 is already multiplayer? So why are you so worried about a mercenary being added? This won't be like Diablo 3 where your mercenary kept saying these annoying and stupid quotes (far out Diablo 3 sucked). They would be silent. Don't forget you make Golems which follow you and the Necromancer has an army of skeletons. Diablo 1 already has minions/players walking around with you.
To further elaborate, I don't really like the argument "co-op ruins the scary atmosphere". People readily use examples like Dead Space, Resident Evil, etc to justify their point. They don't realise that these games atmosphere wasn't solely ruined because they could bring a buddy into the darkness with them, but was ruined because various other things were changed as well. Faster movement speed, lighter scenes, more action based mechanics, whilst removing silence, darkness, and that disturbing sound when metal clashed upon metal, echoing through the background. These games ultimately changed the very things that made them scary. Sure co-op was one of them, but not the only thing.
Sorry, I can say a lot about atmosphere because it's something I do value a lot in a game. I think as long as mercs aren't designed like Diablo 3, we'll be ok. Diablo was always a social game, yet still scary. co-op with fear. It can be done.
Diablo 1 is a real deadly game for NPCs. The monsters deal lots of damage..I believe it would be possible to implement mercs, but with a real lot of work to get a balanced game that would still feel like Diablo1.
I agree. This is the problem with mercs in Diablo 1. I can't see how they could work without them constantly dying. Diablo 1's gameplay doesn't work like Diablo 2.