I think a lot of increasing your kill tally is more to do with choosing the right class appropriate to the play style of the map as well as the game mode. For example, maps using lots of ground vehicles try using Assault Class and getting out a few AT-Mines around flag capture points and on roads leading to Flag Capture areas. Most inexperienced tankers will tend to follow designated routes as it avoids tougher terrain. 3 well placed Mines can easily get you 5 kills if you're lucky with very minimal effort. Don't get me wrong Medic Class is great, even more enjoyable since the recent patch i find, but on maps with Tanks you're more than likely going to get caught out.