"The spark combination is incredible damage wise but is very reliant upon one card."
Good point. However, Gravity Shield will not "completely shut down" this card; just not using Heavy Armor in the presence of Gravity Shield, instead using Chaos Power or Blessing, will work. Adrenaline takes care of Bonewall, and Fire Shield affects EVERY creature in the game now, so that argument is not very strong.
"A deck, in order to be competitive at the PVP level needs several things; it needs a win condition, it needs permenent control, creature control and adaptibity."
Most of the time. However, these decks are often quite large and slow. Rush decks can also be extremely powerful; a Dragon, Poison, Shrieker, or FFQ rush deck is a force to be reckoned with. Additionally, having just one or 2 of those conditions is often enough. Take the Firebolt deck. It has no creature control, but it wins all the time simply because it's very adaptable and it's unconventional, with no creatures. Take any mutation deck. No control whatsoever - just relying on awesome abilities and pure damage. And it works.
"After the intial rush of creatures, these decks either deck out, run out of creatures or die to a well organized deck." AFTER the rush of creatures. Oftentimes, you are unlucky, and even a very well set-up deck will fall to a very fast one. It's true that fast decks fall apart once the defense has kicked in, but it's all about luck in the early stages.
"As for your pillar problem, try increasing number of pillars in your decks or make your decks smaller." My deck is 40 cards big, with 10 Quantum Pillars and 6 Novas, just like many others. This is a very reasonably-proportioned deck, as I'm sure we all can agree. And, usually, it works just fine. But, inevitably, we get bad draws. The point I'm trying to make is that you will get unlucky. Quanta is THE biggest limitation in this game (not by your definition of limitation, of course) in that it's essential to summon your cards with. And, sometimes, you're simply unlucky.