As a casual player, Sh3 wGWX gives me a lot of immersion, but not enough.
Something is missing, and like a flightsim guy I am, I miss the finer controls, actions and communication(!) with the rest of 'us'.
Dangerous Waters is a lot of gameplay, but its to much for one guy, like a PMDG747 at VATSIM on your own, or better an INS equipped 742 at VATSIM.
Almost unable to do alone..
Now on SH3 I dont do manual targetting, I think this is for your crew to figure out. Immersion is in the decision making, what lacks a lot in SH3, since you are on a random encounter course.
Immersion = interraction, not in graphics, nor in the TDC.
Altough graphics helps a lot, for example somehow the modern game graphics, like Sh4 look cartoonish. For me it is.
Same with FS9 vs FSX, something is cartoonish, and it aint FS9.
Just look carefull at pictures of recent games, COD:MW2 for example. Looks good, like Asassins Greed 2, but there is something in the screen filtering that looks wrong. I cant pinpoint it, maybe compare some other games. Original Flashpoint was immersive, maybe due the bad graphics, and the need for imagination (immersion) versus Arma2. Same story, somewhere all those high FSAA games loose something, and then I didnt touch the attention span most games got!
Now for Sh5, I think immersion comes with at least more interraction with BdU, we need orders, goals and missions, more captain decisions, meaning more boat control actions, like ways to safe fuel, and human like enemy counter actions.. luck factors, tiredness, time of day etc.
end of rants..