Spies Are Broken

Every time I use one, I die the moment they look at me funny. Yet every time someone else uses a Spy, they get me in the most impossible ways. I just remember this Spy was literally stabbing in the front of me as a Medic with full health and died every time. Heck, I don't believe the knife is that strong to kill me in one go. Not to mention there was no critical buff on him or anything. Just slash and go like a hacker. Jeez, no wonder why I hate this game. Just lame moments were they can kill anyone like butter.