lgay = newb plane. Just like the spixteen.
Last tour (before the arena format change) I promised to fly nothing but LAs the entire tour. I got 112 kills (100 LA7, 12 LA5FN) to 27 deaths (that's counting "out of gas" ditches and augers, and non-enemy related deaths).
*ME*. I got that score. [EDIT: Read this as shock, due to the fact that I'm a mediocre pilot] In about a week and a half (between when the tour started and when the format changed. I only flew for just over a week during this time period).
LA7 might get you kills. It won't ever give you skills. You have to have the skills first, then fly the plane, or fly the plane but fly other planes to learn new things.