You know, I lose to this card pretty often. I summon a powerful monster, then my opponent take control of it and beat me with my own monster. (Maybe special summoning another monster using Rose Lover or something for an OTK.) But when that happens, it is usually because I only have that 1 monster defending me and no defensive cards. If I had Windstorm of Etaqua or Enemy Controller of my own, I could weather that turn, and on the next turn, my opponent will be at a severe disadvantage. So if you often lose to E-Con in way I described... then you're probably too reliant on just a single monster and not having enough defensive cards. YGO is all about anticipating your opponent and counter play, so go and formulate a counter strategy!
That said, there is this once I defended myself using Etaqua... but then my opponent played Ultimate Providence to counter my trap, and proceed to beat me using my monster plus his own Carrot. That kind of stuff happens.
The problem with enemy controller is that it's a true "Get out of jail free" card, which should never exist in any game. It gives everyone a free win for no effort, which takes all the fun out of the game.
I wouldn't go that far. E-Con will only result in your loss if you only have exactly one powerful monster on your side, and don't have any defensive cards. What E-Con really does is punish people for having only one (face-up) monster or not having enough defensive cards. I hate E-Con too, but it is definitely possible to play around it... which is what I'm training to do now.
Aquablast
Aquablast
