I normally play shooters (half way through Bioshock) but I'm hooked on SH4. Seems a bit hardcore having to draw the angles etc etc on the map and stalking the enemy for ages just to get one kill but its soooo satisfying when you get one.
And for a bit of a quick fix you can always use the deck gun. The only way I could seem to shake off a subchaser was to surface at just the right time, knock a huge hole in the engine room with an armour piercing shell and then sneak away while he was burning - nice
