Let's have a belated discussion on the Spy/Sniper Update.
I. Love. Jarate.
Definitely the most useful weapon swap out I've personally gotten since they introduced new weapons. I've changed my Steam name in reflection of this feeling. Hitting someone with Jarate just makes me feel so good on the inside that sometimes I don't know if I can take it. But that's not all; Jarate is useful in a practical sense as well. Putting out flaming teammates or even fires afflicting your own person is awesome, plus the mini crits are a great way to provide support for your teammates in battle on top of shooting the enemies from 20 yards away.
The Spy updates are pretty cool too, offering 2 new variations on the cloak watch. I personally like the Cloak and Dagger (Edit: Actually I'm using the Dead Ringer!) a lot.
Now a few negative criticisms. The Razorback doesn't seem to be very useful. I don't have it myself. But the only time I've encountered it on the field I back stabbed the Sniper to see what would happen. The Razorback broke, the Sniper survived, but I didn't notice getting damaged or a cool down time on my knife. I was easily able to stab him in the back almost immediately after destroying the Razorback. Hopefully this gets fixed.
I also think they really should have implemented the trading system when they started the random unlock system for the weapons. I've got 5 Sandviches at the moment and no idea what to do with them. Also I've noticed that low latency servers are still very laggy for me occasionally. I think this is because spectators are clogging up the works, waiting to unlock stuff by leaving the game on for days.