I have always enjoyed simulation games & have a great interest in WWII. I saw a friend play silent hunter I at a lan party so I watched him play a bit. He ended up giving it to me & about a year later I played it shortly- I have waaay too many games that I like so bounce around a lot. I liked the cat and mouse of it and the charting but it didn't really spark yet.
Later on I saw SHII so I bought that & played it a great deal more. The rolling seas, running smack dab into a convoy in heavy heavy fog & trying to escape hunter/killer groups got me hooked. Also I like the slow pace which I can choose to speed up or keep slow.
I got SH3 because the sub rolls with the sea & the crew. I didn't like manning a one man sub that never moved especially when my favorite feature in the game is the rolling seas. I must say the community here keeps me playing as well, I get to reading some patrol stories then I am inspired to go out on patrol