Units who've won you over?

Bow samurai.

They shoot arrows and wield a mean sword; always use a cpl to back up my main line.
Game winners? No, but they are flexible and tough, allowing my heavy hitters to do something besides "line maintenance".

The fearless ladies are great! Had some on a castle defence and they just killed anything thrown their way. The only time I faced them on the field I turned every bow available on them :p