Blockland has a style of projectile combat that most games don't. Most games use raycast weapons, or instant hit weapons. Blockland has slow moving projectiles. It kinda sucks because Ive become custom to Blockland physics and cant play any other TDM based game well. Team Fortress 2? I might as well try and cut a steak with a stick of butter.
If you want to get good at Blockland combat, you need to play more Blockland DMs.
Tribes: Ascend. has about the same mechanics as Blockland though. Same as for Unreal and Quake's rocket launchers.
In the assumption you are talking about the projectile weapons:
Try to learn how your momentum affects the bullet. Go in singleplayer and put some red bricks here and there, and while at a distance, move left and right and try to see what distance from each brick would it be good to hit it. Aiming while standing still is easier, because you just need to think where the person will be next, but aiming while moving is a lot trickier. The bullet will not hit your crosshair, so practicing moving+shooting is a good idea than just shooting players while standing still.
After you can handle that remotely well, try doing the same while jumping.
