I started him in SCIII when he was a soul for the Knight class. In IV I still liked his style, I've always been a fan of fencing as almost an art form as much as a form of combat. In V though, when I actually just started to play well I finally started to really learn his move set like all my...
I main Hilde, but Siegfried was my main in 3 and 4 and is now my secondary in V. Really you shouldn't worry about match-ups with him considering you "should" still learn how to beat "every" character.