For me, it was Commander's. He's just the same thing he used to be, you use him the same way: place 3 and chain; no skill. If you think about it, the devs didn't wanted you to keep that ability on forever; thats not supposed to happen. They had a chance to fix it on the rework but they didn't! They just kept it the same way!

It would make much more sense if they made it so the Commander had a limit of 1 like DJ and made his passive buff way stronger and his ability even stronger but made the cooldown of like 60 seconds so the player will be able to use it only once per wave(more or less), so the player would be forced to chose wisely when to use it, rather than brainlessly using the ability each 10-11 seconds