Its mostly your aim im sorry... not the game but you
1st guy the reason you did not kill him was because you have to be at an extremely close range to kill someone with the marshall... he killed you for a reason you did not have a chance of killing him from that range, you could have just went up to him an shot him since he had his back turned but i guess you were just testing the range on the marshall it happens to everyone

2nd guy had armor mode on and you didnt aim slighty ahead of him but a little behind and thats why you missed so many shots always aim ahead of the moving target for the best results
but idk it could have been the game im not the one to judge
