Krucifier said:true, but still it is an *EXAMPLE*, I am not saying it would do that every time
Mew ex is the only truly broken ex out there right now, and it doesn't even fit into everything, nor is it unbeatable. 90HP and psychic (ie SELF) weakness put a pretty solid wall in front of it.
It's true that Mew ex is absolutely insane in many decks and in many matchups, but it's so breakable that it's fine the way it is.
Don't be so melodramatic.
Pokemon ex are not all game winners, and most take skill to use.