I do not know why charizard is so overrated.
yes i know, he is very powerful, and he is not as bad as some cards.
lets look at his stats:

Charizard
Stg. 2 Pokémon
weakness: water
resistence: fighting -30
retreat: 3 colorless
Pokémon power: energy burn: As often as you like (during your turn)
you may turn a energy attached to charizard into [F] energy.
Damage: 100
Fire spin
Discard 2 energy cards attached to charizard to use this attack.

As i said, charizard is not completley horrible.

Pros:
High attack: He has a 100 attack, which can take down almost anything.
Power: the power allows you to use any type of energy, which can be helpful
if you are in a fire enegy crisis.
Resistance: I beleive a resistence to fighting is good, because most haymaker
decks rely on hitmonchan's special punch, it would cancel his first move, and
reduce his second attack to 10, so it will take him 10 turns to ko you,
unless he
is using Gust of wind and energy removal.
H.P: he has a high HP so he could last pretty long.

Cons:
Retreat cost: A 3 retreat cost? you better have a few switch(s) or, bye bye
charizard!
Weakness:  weakness to water? with a fully powered blastoise and/or a
raindance
deck, you could be k.o.'d in one attack!
Attack: lets review charizards attack. [F] [F] [F] [F] 100 damage.
not too bad, but discard energy? if you run out of energy, bye bye!

Ok so i gave you some pros and cons about charizard.
as you see, he has good points and weak points.

One other thing i should address, is why does everyone think is so god darned
rare? at 30$, he is the most expensive card. I think he tends to be overated
because of his attack. It seems to be all people think about. i think if half
the people who
had him, would read(read the card) his attack, they would realize how he is
not the absolutley best card, yes he is ALOT better than zapdos(discard all
energy?)
but he is not the complete best. I am not one of those charizard hating
maniacs,
because he happens to be my favorite pokemon. he is about as rare as every
other
holo besides the ones in the decks.
so, as you can see, charizard is not the best card, but not the worst.

      ~~~~~~~Raven~~~~~~~~
What about me? What about Raven?
~~~~~~~~~~~~~~~~~~~~~~~~~~~