You have to think of the game in terms of offence and defense, or for FPS, it's aim versus dodging ability. In Quake 2, Vanilla Quake 3 and Quake Live, we have the perfect balance, the movement speed is fast enough to get around the maps and also have a chance at dodging someones aim but it's also slow enough that it's still possible to aim at.

Then there's strafe jumping. Which is basically only an increase in speed in a straight line, so even with the extra speed, the movement is easy to predict, that means it's great for decreasing walking times, and still good to aim at.

Now lets talk CPMA, ProMode or Turbo, the movement originally from QuakeWorld. There would be Quake purists out there who will say it needs this movement to be Quake and fair enough, that's what you learned, that's what you love, ok, I get that.

But from a more objective point of view, it upsets the balance. When you add in air control to the game, especially this kind, not only are you increasing the speed, you're making the dodging ability overpowered. Now it's no longer about straight lines, the movement becomes too random, so in those modes and games, defense is a huge advantage over offence.

Not too big a problem in things like duel, but in modes where rocket jumping doesn't do self-damage, it's absolutely ridiculous.

If you look at my rocket jumping, it's a similar advantage, but because there's no real air control, it's just a faster version of strafe jumping, still in straight lines and still easy to predict. If you watch me in competition matches, I don't rocket jump around.

Why? Because it's too easy for most good players to hit. I use it to get in position quickly, not avoid people's aim.