You dare insult my waifus?
Well, everyone has their own taste, no?
One thing I usually adore doing is roleplay while playing any game involving subs. It's also doable with an aircraft, but meh, I can't really feel the vibe I'm feeling when looking at a sub. Tanks and ships are definitely a no, because well.... most games already have built-in crew voices, which screw the immersion up so badly that I just have to settle for listening to music while driving them, if I'm not playing with other people.
Subs, on the other hand, are perfect for immersion and letting my imagination run wild. I can listen to Wagner for hours while sneaking around and sinking ships, or just plain look at the lovely design and pretend to be a commander, because even I need a break from all the idiocy of this world, and just let my inner child out.