When playing Star Wars: Battlefront multiplayer on the Hoth level, here is my advice. Be the Rebels, be a pilot, and run straight for the snowspeeder before other players get it. This level is completely unfair because the Rebels have aircraft and the Empire does not. As a pilot in the snowspeeder, you will be almost invincible. If you take more than half damage, fly away from the battle and as high up as you can get. Wait until your piloting skills repair the vehicle and then rejoin the battle.
You can use the Empire ground troops for target practice as you go on repeated strafing runs. Anyone without a missile launcher will be helpless against you, and even if they have missiles you can usually dodge them. The only problem with this strategy is that after doing it once or twice it gets boring.
Then you'll want to try something else, like joining the Empire and trying to shoot down the snowspeeders. I've shot down only 1 so far. I think if enough of the Empire players would all spawn with missile launchers and all shoot at once, it should be easy, but people don't seem to do that.