Oh man, I feel the pain of all of those. With #1, it can be even worse if you time your jump over a short ledge a certain way. If you hit something shortly after you jump, you'll not only have no forward momentum, but actually bounce backwards and likely get killed because of it. But to add a #6: Teammates either pushing you into gunfire, or grouping up in such a way that holds up a big neon sign above their heads, saying "V USE YOUR SUPER/ROCKETS HERE! V".