Thunder - Ability needs a longer cool down. Thunder is the first & only merc banned instantly in pugs / scrims for a reason - And in those you can only have 1 thunder. In pub games it’s a joke. 2-3 Thunders can pretty much shutdown the entire map. If you turn away from his ability, both the conc / flash should not effect you. Maybe need to lower health?
Proxy - Unable to self-explode your mines until they become activated. Would stop this semi-suicidal proxies & those who run about with mines out as primaries.
And finally. The spam-jump-shoot breed needs pinning down. A decent player will jump 1 or even 2 times in a fight. Off a wall, initial engagement, whatever. These who jump 5 times before they even shoot, or jump-shoot, jump-shoot, jump-shoot, jump-shoot, jump-shoot. RETARDED. Make the accuracy after the first jump low or introduce stamina, so you simply can’t jump more than 3 times in quick succession?
