They didn't ruin the deagle per-say... they just nurfed its ability to shoot accurately most of the time, while moving. It’s a different style of play that works with the deagle now. If you can get that one quickly aimed headshot on the enemy without moving, then you’re good to go. If you used to play the deagle, being very agile and spraying at the enemies torso while moving around hoping that you kill him before he kills you. Then you are going to have a harder time excelling with that weapon.