Just a "quick" overview of what's good and why.

Note: Hyper speed is referenced multiple times here. This is a bug(?) where after reaching speeds over 160 km/h, you continue accelerating like crazy while traveling in a straight line, allowing you to reach speeds of over 500 km/h with a good boost under ideal conditions. Making good use of hyper speed when possible is huge for cutting time, and much of what makes something good is how easily and consistently it works to give hyper speed.

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When your gauge is full and you have a weapon, and there is an enemy behind you, then first you can shot the enemy behind and then you use ultimate skill of that weapon that costs gauge as soon as you used it to enemy behind.

This trick works the best with rocket launcher the most, because it just lock down your enemy by one hit, and it has range, and ultimate skill goes front side permanently until it hits your enemy in front, like a guided missile.