It's not bad. The only deck this affects is the instatosis deck if you use a liquid shadow to get an EM after being brought down to like 20 hp or something. This is actually good. The game should be over instantly, the moment someone hits 0 hp, before any other effect happens.
People are always saying decks are being ruined. Well they are dead wrong. The thing you must do now is try out different strategies possibly changing some cards up if you want the exact same effect your deck had before. The decks can be played with the same cards as before, you just need to play differently. If you change cards, your strategy will change.
Change is good, people are just afraid of change.