Prime (or anyone with a similar analysis to his), I am going to ask that you read my post in its entirety, despite its length. I've tried not to go into my usual excess, but there is a definite break in communication. If you believe you are answering and countering my analysis... I just don't see it. Instead it comes across as either not reading it or not comprehending what I am saying. I don't want to spread false hope, so please take time to answer clearly, even if you feel like you have to talk down to me or be overly detailed.
I get the reasoning of the EXs. In the past, legendary Pokemon have been weak, when you consider they are very strong in the video games and almost god-like in the cartoon. These EXs are very strong and fair to the idea of legendary Pokemon, but the way they are implemented is poisonous for the health of the game. And I'm not sure they could be implemented in any other way.
Several of the Pokémon-EX are not (or are no longer) successfully played competitively: most Pokémon-EX are "average"
or worse. So what do the "best" Pokémon-EX, the ones that seem "broken", have in common?
1) Inexpensive attack (relative to available Energy acceleration) they can access by that player's second turn
at the latest.
2) Great Ability that can be accessed simply by dropping it into play.
3)
Both 1 and 2!
Unlike MTG or other card games, Pokemon don't have costs. The only psuedo-cost is evolution. Unfortunately, none of the legendary Pokemon are evolutions, so they can be in play on turn 1. It's like when Ash's opponent summons Latias. It's just not fair to any other non-EX in the format. It's not a balanced play field when a player can get out a 180HP EX on turn 1 and possibly even attack.
You forgot about Energy costs to attack.
Such a cost may seem like a joke but
that's because it is the main problem. It has almost always been a problem, just less of one in some formats. Big basic Pokémon (whether Pokémon-EX or plain)
should not have damaging attacks available for a player's first turn, and probably not for the second; at most allow them a token filler attack. Abilities need to be handled similarly - if it generates fast advantage, it probably needs to be restricted to a Pokémon with some set-up or other cost involved.
Why? Because then it takes time to build them!
So there is an inherit problem with the game representing these strong Legendary Pokemon. They either come out too weak, as is the case of many of the non super rare versions of them, or they come out too strong, which is the case for many of the current EXs.
My analysis is that most of this comes from the execution itself. Yes, hindsight is 20-20 and it is easy to play armchair [DEL]quarterback[/DEL] card designer. There is also the other historical flaw; Evolutions tend to be best because
1) They are arbitrarily beefed up to compensate for being slower e.g. stronger attacks and more HP. Instead they are the ones that can afford to have the inexpensive-but-good Abilities and attacks, because they aren't hitting the field first turn.
2) Evolution acceleration - we've seen several formats like this. I won't deny that they may be amongst the best in the game, but they still would have been better with appropriate balance. Generic Evolution acceleration is a terrible idea; if it isn't "pre-nerfed" such acceleration becomes broken.