When people pick a radec, kratos, or drake and spam like crazy I play as cheap as I can, otherwise I do my best to actually play technically as I can.
I've had a game with multiple Kratos's and ended up getting mad and spamming radec's rifle.
I try to play fairly, but I did have a bittersweet victory with Drake once in Ranked. There was a (pretty good) Good Cole in the match who had a Level 3 that he worked pretty hard for, and right at the exact moment he was about to use it, I used Drake's Level 2 on everyone. I ended up killing him and cancelling his Level 3, and his AP meter was back down to 0. I didn't even know something like that was possible.
I ended up winning the match, but I felt horrible because I would also be pretty ticked if someone cancelled a Level 3 that I worked hard for.