Tsukune, you saw me do my test with them. They're solid, and if you aren't prepared, they are absolutely devastating. I think Konami didn't intend for them to be as powerful as they are on their own. If you notice, each dragon has an effect that is reminiscent of it's attribute, such as Blaster's effect that can pop a card, bearing resemblance to fire's destructive nature.
I must also point out that the deck isn't as flawless as everyone says. Cards such as Soul Drain negates all of their abilities that activate in the graveyard (such as special summoning themselves and the above mentioned Blaster's effect). With the new card in the "Drain" series soon to be released (Mind Drain) it will make the deck almost entirely unplayable, negating ALL effects that activate in the hand (that start a chain) such as... well, these dragons.
I'm going to have say I am neutral on them. I try to run everything at least once.
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Subject: E-Drag Opinion 
When a Spell, Trap, Spell/Trap effect, or Effect Monster's effect is activated that destroys a card(s) on the field: You can Tribute this card; negate the activation and destroy it. During the End Phase, if this card negated an effect this way during this turn: You can Special Summon this card from your Graveyard.