When you ski down a hill at 300km/h, you shouldn't be picking up speed, you should be losing speed.
You can only accelerate to a point when skiing. If you're going faster than that terminal velocity, you will decelerate.
The jetpacks are terrible because of how weak they are. If you are standing still, they work fine, but if you fall off a ledge, you have to use 100% of your jetpack to get back on that ledge, which is extremely frustrating in the genroom and some of the flagstands, and generally anywhere with a ledge.
This annoys me, but you learn to live with it. I stay awya from anywhere with a ledge for any real length of time.
On top of that, the jetpack has a cap to its speed gain, meaning that past 80km/h or so, you won't gain any speed using it, only height. Of course, if you gained more speed, the thruster pack would become obsolete
The thrust pack is for taking you to 140kmph from a standing start. If you're using it to gain speed after you start moving, you're doing it wrong.
The BRT and SLD don't have a place in the game right now. They are viable (on pubs), sure, but RDR and JGN are pretty much better in every way, apart from energy.
Don't necessarily disagree with the Soldier, but the Brute has it's place. Fractal grenades will render capping a flag completely impossible for ~6 seconds - and you can carry three of them. That's 18 seconds of denial per trip to the inventory station, which is incredibly handy when your team mates can just fly through it. The Brute also has way more staying power than the Juggernaut, since he has the same shield pack as the Raider and can take the same splash damage to energy converting perk. A skilled Brute who knows when to take damage on energy and when to take it on health is incredibly hard to take down.