StingingVelvet: For me I would say immersion is what is core to my gaming enjoyment.
ET3D: I don't have a problem immersing myself in pretty much anything. Pure shooters (which I don't play a lot) are probably the best for that, since you just don't have time to think about anything but the game world, and because their interface is mapped to a simple understanding of the real world (first person with easy movement).
I probably enjoy stories more, though, which is why I prefer RPG's and adventure games. I also enjoy minor challenges. I want to have some challenge, but easy enough that it won't stop my progress. I enjoy being made to think, without being punished for not thinking well enough.
Agreed, I'd much rather deathmatch in Doom, ROTT or if it were possible Wofl3D than newer games as it's a lot more mindless. I don't really have to aim up or down, I can just blast away without thought.
But, I do think that it really depends, I like the progression of Diablo, but ultimately, Blizzard doesn't put enough effort into avoiding the grinding. D2 had I think 6 quests per act, IIRC, which inevitably leads to a fair amount of grinding before you get to the point where you're ready to finish the act and move on. I never finished that last act of D2 because it got too grindy for me to stand.
From the looks of it, TL2 seems to be significantly less grindy that Diablo, and hopefully will be a better play than TL was.
N0x0ss: If immersion is what you seek. you could just watch a movie. Less time consuming than video games, immersion is quicker, and sometimes cheaper.
Immersion alone can be achieved by cutscenes, cinema tics, great voice acting and good story-telling. The real question that you have to ask yourself, is , wether the "gameplay", the control you have over your character, amplifies your "immersion" to a degree not found in the movies, or is it just another aspect of gaming you like as well.
Cut scenes, cinematics? I guess it just goes to show that people can and do vary because I find those things to kill the immersion factor quickly than just about that. But, then again, I have a very powerful imagination and I remember even before I had access to sound just about jumping out of my seat whenever I'd see an enemy in an unexpected place in Wolf 3D, or the Catacombs Abyss.
But, with sound and music, those same games are incredibly immersive.