As title said , 70% of units are useless (including the units you can unlock in events) , It became a little bit boring playing with same and against same units again and again. Maybe you guys could buff some units , especially the ones which can be unlocked only in events ? Even miners are more useful than e.g: hellfire , inferno , gravity and frost tank. I mean you can keep everything same but it would be a more interesting playing against more useful units , than just few of them . And adding old DPS mods back again would be good, only oldest players have them available.